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  • All fields: Hydraulic
(722 results)



Display: 50

    • Placer mining

    • A view of a placer mining operation possibly in Colorado. What may be a sluice leads down to a river.
    • Hydraulic mining--1890-1910.; Mining--1890-1910.
    • [between 1890 and 1910]
    • Placer mining

    • A view of a placer mining operation possibly in Colorado. Workers use placer mining machinery.
    • Hydraulic mining--1890-1910.; Miners--1890-1910.; Mining--1890-1910.
    • [between 1890 and 1910]
    • Hydraulic mining operation

    • View of a placer mine by a river; miners pose by a rocker and sluice, climbing a pole, and in an ore car. A furnace and barrels are by pipes and a ditch; frame buildings, automobiles, and a freight car with letters: "C N N" [?] are in the...
    • Hydraulic mining--1910-1920.; Miners--1910-1920.; Mining--1910-1920.
    • [between 1910 and 1920?]
    • Mining Claim 14 and 15 below discovery, Deadwood Gulch, miners running sluice boxes

    • Gold miners (one Black) stand by a wooden sluice in Deadwood Gulch in Lawrence County, South Dakota.
    • Deadwood Gulch (S.D.)--1870-1880.; Lawrence County (S.D.)--1870-1880.; African Americans--South Dakota--Lawrence County--1870-1880.; Gold mining--South Dakota--Lawrence County--1870-1880.; Hydraulic mining--South Dakota--Lawrence...
    • [1876]
    • Flume near Idaho Springs

    • View of a wooden flume at probably a placer mine on Chicago Creek near Idaho Springs in Clear Creek County, Colorado. Shows a timber foot bridge over the creek, log cabins and tailings piles.
    • Chicago Creek (Colo.)--1860-1870.; Clear Creek County (Colo.)--1860-1870.; Flumes--Colorado--Clear Creek County--1860-1870.; Hydraulic mining--Colorado--Clear Creek County--1860-1870.; Streams--Colorado--Clear Creek County--1860-1870.
    • 1867
    • U.S. Gold Placer Ditch, looking up the San Miguel Valley, Colo.

    • View of a dirt embankment beside a ditch, and a placer site of the U.S. Gold Placer Company in Montrose County or San Miguel County, Colorado. A pile of lumber and large rocks are beside the ditch. Shows the San Miguel River in the valley.
    • San Miguel River (Colo.)--1880-1890.; Gold mining--Colorado--1880-1890.; Hydraulic mining--Colorado--1910-1930.; Rivers--Colorado--1880-1890.
    •  
    • U.S. Gold Placers

    • Aerial view of the San Miguel River, a truss bridge, and probably a placer mine site of the U.S. Gold Placer Company, in Montrose County or San Miguel County, Colorado. Shows a frame building and trees by the river.
    • San Miguel County (Colo.)--1880-1890.; San Miguel River (Colo.)--1880-1890.; Buildings--Colorado--1880-1890.; Gold mining--Colorado--1880-1890.; Hydraulic mining--Colorado--1880-1890.; Rivers--Colorado--1880-1890.
    •  
    • U.S.G.P.

    • Aerial view of a U.S. Gold Placer Company hydraulic placer mine site beside the San Miguel River in Montrose County or San Miguel County, Colorado. A man poses on a hillside. Water from hydraulic monitors (nozzles) sprays over gravel in the...
    • San Miguel River (Colo.)--1880-1890.; Gold mining--Colorado--1880-1890.; Hydraulic mining--Colorado--1880-1890.; Rivers--Colorado--1880-1890.
    •  
    • Mining dredge

    • A man stands near the Derry Dredge, Empire Gold Dredging Company's hydraulic placer bucket-line vessel, near Leadville (Lake County), Colorado.
    • Lake County (Colo.)--1910-1930.; Dredges--American--Colorado--Lake County--1910-1930.; Gold mining--Colorado--Lake County--1910-1930.; Hydraulic mining--Colorado--Lake County--1910-1930.
    • [between 1915 and 1926]
    • The Colo. Gold Dredging Co. on the D.& R.G.R.R. at Russell, Colo.

    • Men in suits, one woman and workmen stand on top of and beside a Colorado Gold Dredging Company hydraulic placer gold mining dredge near Russell, Veta Pass (La Veta Pass), Colorado. Shows an American flag on a flagpole.
    • Russell (Colo.)--1900-1910.; Dredges--American--Colorado--Russell--1900-1910.; Gold mining--Colorado--Russell--1900-1910.; Hydraulic mining--Colorado--Russell--1900-1910.
    • [between 1900 and 1910?]
    • The Colo. Gold Dredging Co. on the D.& R.G.R.R. at Russell Colo.

    • View of workmen on a Colorado Gold Dredging Company hydraulic placer gold mining dredge near Russell (Costilla County) Veta Pass (La Veta Pass), Colorado. Shows men in suits near workmen, construction tools, barrels, railroad ties and planks.
    • Russell (Colo.)--1900-1910.; Dredges--American--Colorado--Russell--1900-1910.; Gold mining--Colorado--Russell--1900-1910.; Hydraulic mining--Colorado--Russell--1900-1910.
    • [between 1900 and 1910?]
    • Placer mining near Russel [sic], La Veta Pass

    • Men in suits, one woman and workmen stand on top of, in windows and beside a Colorado Gold Dredging Company hydraulic placer gold mining dredge near Russell (Costilla County), Veta Pass (La Veta Pass), Colorado. Shows an American flag on a flagpole.
    • Russell (Colo.)--1900-1910.; Dredges--American--Colorado--Russell--1900-1910.; Gold mining--Colorado--Russell--1900-1910.; Hydraulic mining--Colorado--Russell--1900-1910.
    • [between 1900 and 1910?]
    • Golconda placer mine, La Plata Mountains, Colo.

    • View of the Golconda Group Mine near Summitville in Rio Grand County, Colorado. A sluice box sits in an excavated trench. Men work near the trench. Mount Hesperus (Hesperus Mountain) is in the distance.
    • Golconda Group Mine (Rio Grande County, Colo.)--1890-1900.; Hesperus Mountain (Colo.)--1890-1900.; Summitville (Colo.)--1890-1900.; Hydraulic mining--Colorado--Summitville--1890-1900.; Mining--Colorado--Summitville--1890-1900.;...
    • 1893
    • Golconda extension placer mine, La Plata Mountains, Colo.

    • View of the Golconda Group Mine in Summitville, Rio Grande County, Colorado. Shows wood plank building, log cabin, and tent. A sluice box sits in an excavated trench. Men are in the distance.
    • Golconda Group Mine (Rio Grande County, Colo.)--1890-1900.; Summitville (Colo.)--1890-1900.; Hydraulic mining--Colorado--Summitville--1890-1900.; Mining--Colorado--Summitville--1890-1900.; Sluices--Colorado--Summitville--1890-1900.
    • 1893
    • Hydraulic Mining

    • View of placer mining operations in probably Alder Gulch (Madison County), Montana. Men spray water at an embankment with monitor nozzles.
    • Alder Gulch (Madison County, Mont.)--1880-1900.; Madison County (Mont.)--1880-1900.; Gold mining--Montana--Madison County--1880-1900.; Hydraulic mining--Montana--Madison County--1880-1900.; Miners--Montana--Madison County--1880-1900.;...
    • [between 1880 and 1900?]
    • Panning for gold at Cripple Creek, Colorado

    • Men watch a miner pan for gold in Cripple Creek stream near Cripple Creek (Teller County), Colorado.
    • Cripple Creek (Colo. : Stream)--1890-1900.; Cripple Creek (Colo.)--1890-1900.; Gold mining--Colorado--Cripple Creek--1890-1900.; Hydraulic mining--Colorado--Cripple Creek--1890-1900.; Miners--Colorado--Cripple Creek--1890-1900.;...
    • [1891?]
    • Keystone Placer Mine, sluice boxes

    • View of the Keystone Placer Mine in San Miguel County Colorado. Shows mining buildings and sluice apparatus.
    • Keystone Mine (San Miguel County, Colo.)--1880-1900.; San Miguel County (Colo.)--1880-1900.; Flumes--Colorado--San Miguel County--1880-1900.; Hydraulic mining--Colorado--San Miguel County--1880-1900.; Mine buildings--Colorado--San Miguel...
    • [between 1882 and 1900?]
    • Keystone placer mine giant at work

    • View of mining operations at the Keystone Mine in San Miguel County, Colorado. Shows sluice boxes and a large pipe with hydraulic nozzles.
    • Keystone Mine (San Miguel County, Colo.)--1880-1900.; San Miguel County (Colo.)--1880-1900.; Flumes--Colorado--San Miguel County--1880-1900.; Hydraulic mining--Colorado--San Miguel County--1880-1900.; Mining--Colorado--San Miguel County--1880-1900.
    • [between 1882 and 1900?]
    • Placer mining on the San Miguel River

    • View of mining operations along the San Miguel River in San Miguel County, Colorado. Plumes of water emerge from pipes with hydraulic nozzles (monitors).
    • San Miguel County (Colo.)--1880-1900.; San Miguel River (Colo.)--1880-1900.; Hydraulic mining--Colorado--San Miguel County--1880-1900.; Mining--Colorado--San Miguel County--1880-1900.; Rivers--Colorado--San Miguel County--1880-1900.
    • [between 1882 and 1900?]
    • WPCD mucking left 3/4

    • A man loads rubble onto an ore car in a tunnel at the West Portal of the Alva B. Adams Tunnel (Continental Divide Tunnel) of the Colorado Big Thompson project in Grand County, Colorado.
    • Alva B. Adams Tunnel (Colo.)--1940-1950.; Grand County (Colo.)--1940-1950.; Hydraulic facilities--Colorado--Grand County--1940-1950.; Interiors--Colorado--Grand County--1940-1950.; Laborers--Colorado--Grand County--1940-1950.;...
    • [between 1940 and 1950?]
    • WPCD mucking right 3/4

    • Men load rubble onto ore cars in a tunnel at the West Portal of the Alva B. Adams Tunnel (Continental Divide Tunnel) of the Colorado Big Thompson project in Grand County, Colorado.
    • Alva B. Adams Tunnel (Colo.)--1940-1950.; Grand County (Colo.)--1940-1950.; Hydraulic facilities--Colorado--Grand County--1940-1950.; Interiors--Colorado--Grand County--1940-1950.; Laborers--Colorado--Grand County--1940-1950.;...
    • [between 1940 and 1950?]
    • WPCD mucking bucket spilling

    • Men work in a tunnel at the West Portal of the Alva B. Adams Tunnel (Continental Divide Tunnel) of the Colorado Big Thompson project in Grand County, Colorado.
    • Alva B. Adams Tunnel (Colo.)--1940-1950.; Grand County (Colo.)--1940-1950.; Hydraulic facilities--Colorado--Grand County--1940-1950.; Interiors--Colorado--Grand County--1940-1950.; Laborers--Colorado--Grand County--1940-1950.;...
    • [between 1940 and 1950?]
    • WPCD mucking bucket spilling

    • Men load rubble in a tunnel at the West Portal of the Alva B. Adams Tunnel (Continental Divide Tunnel) of the Colorado Big Thompson project in Grand County, Colorado. One man smokes a cigarette.
    • Alva B. Adams Tunnel (Colo.)--1940-1950.; Grand County (Colo.)--1940-1950.; Hydraulic facilities--Colorado--Grand County--1940-1950.; Interiors--Colorado--Grand County--1940-1950.; Laborers--Colorado--Grand County--1940-1950.;...
    • [between 1940 and 1950?]
    • Manion Placer

    • View of a steam shovel and ore processing machinery with a conveyor elevator.
    • Conveying systems--1940-1950.; Hydraulic mining--1940-1950.; Mining machinery--1940-1950.; Steam shovels--1940-1950.
    • [between 1940 and 1950?]
    • EPCD camp from above portal

    • View of construction at the East Portal of the Alva B. Adams Tunnel (Continental Divide Tunnel) of the Colorado Big Thompson project in Larimer County, Colorado.; shows tracks, sheds, pipes, pipe sections, tailings, rocky crags, cirrus and cumulus...
    • Alva B. Adams Tunnel (Colo.)--1940-1950.; Larimer County (Colo.)--1940-1950.; Construction--Colorado--Larimer County--1940-1950.; Hydraulic facilities--Colorado--Larimer County--1940-1950.
    • [between 1940 and 1950?]
    • West Port[al] CD muck train coming out of tunnel

    • Men stand by a muck train that emerges from the West Portal of the Alva B. Adams Tunnel (Continental Divide Tunnel) of the Colorado Big Thompson project in Grand County, Colorado. Sign reads: "Positively No Admittance."
    • Alva B. Adams Tunnel (Colo.)--1940-1950.; Grand County (Colo.)--1940-1950.; Cable railroads--Colorado--Grand County--1940-1950.; Construction workers--Colorado--Grand County--1940-1950.; Construction--Colorado--Grand County--1940-1950.; Hydraulic...
    • [between 1940 and 1947?]
    • West Port[al] CD cable car & electronics

    • Men pose by cable driven cars inside the West Portal of the Alva B. Adams Tunnel (Continental Divide Tunnel) of the Colorado Big Thompson project in Grand County, Colorado.
    • Colorado-Big Thompson Project (U.S.)--People--1940-1950.; Alva B. Adams Tunnel (Colo.)--1940-1950.; Grand County (Colo.)--1940-1950.; Cable railroads--Colorado--Grand County--1940-1950.; Construction workers--Colorado--Grand County--1940-1950.;...
    • [between 1940 and 1950?]
    • West Port[al] CD timbering action

    • Men examine metal shoring near the West Portal of the Alva B. Adams Tunnel (Continental Divide Tunnel) of the Colorado Big Thompson project in Grand County, Colorado
    • Alva B. Adams Tunnel (Colo.)--1940-1950.; Grand County (Colo.)--1940-1950.; Construction workers--Colorado--Grand County--1940-1950.; Hydraulic facilities--Colorado--Grand County--1940-1950.; Interiors--Colorado--Grand County--1940-1950.;...
    • [between 1940 and 1950?]
    • W.P.C.D. mucking

    • Men load rubble onto ore cars in a tunnel at the West Portal of the Alva B. Adams Tunnel (Continental Divide Tunnel) of the Colorado Big Thompson project in Grand County, Colorado. The men wear work overalls, hard hats, and electric mine lamps....
    • Colorado-Big Thompson Project (U.S.)--People--1930-1950.; Alva B. Adams Tunnel (Colo.)--1940-1950.; Grand County (Colo.)--1940-1950.; Employees--Colorado--Grand County--1940-1950.; Hydraulic facilities--Colorado--Grand County--1940-1950.; Mine...
    • [between 1940 and 1950?]
    • So. Platte Dr. Co. gen. view

    • View of the South Platte Dredging Company hydraulic placer gold mining dredge probably near Fairplay (Park County), Colorado. Tailings piles are nearby.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Fairplay (Colo.)--1930-1950.; Dredges--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.; Mining--Colorado--Fairplay--1930-1950.
    • [between 1930 and 1950?]
    • So. Platte Dr. Co., rollers

    • View of roller mechanism on the South Platte Dredging Company hydraulic placer gold mining dredge near Fairplay (Park County), Colorado.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Mining machinery--Parts--Colorado--Fairplay--1930-1950.; Fairplay (Colo.)--1930-1950.; Dredges--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.;...
    • [between 1930 and 1950?]
    • Water supply ditch, So. Platte Dr. Co.

    • View of a ditch that leads to the South Platte Dredging Company hydraulic placer gold mining dredge near Fairplay (Parker County). Gravel tailing piles are nearby and mountains are in the distance. Shows part of the dredge.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Fairplay (Colo.)--1930-1950.; Dredges--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.; Mining--Colorado--Fairplay--1930-1950.; Tailings...
    • [between 1930 and 1950?]
    • So. Platte Dr. Co., tragles [sic.]

    • Water flows from pipes into long sluice boxes on the South Platte Dredging Company hydraulic placer gold mining dredge probably near Fairplay (Park County), Colorado.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Mining machinery--Parts--Colorado--Fairplay--1930-1950.; Fairplay (Colo.)--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.; Interiors--Colorado--Fairplay--1930-1950.;...
    • [between 1930 and 1950?]
    • So. Platte Dr. Co.

    • View of iron beams, cables, and pulleys on the South Platte Dredging Company hydraulic placer gold mining dredge near Fairplay (Park County), Colorado.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Fairplay (Colo.)--1930-1950.; Hoisting machinery--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.; Mining--Colorado--Fairplay--1930-1950.
    • [between 1930 and 1950?]
    • So. Platte Dr. Co.

    • View of an extended arm and conveyor belt on the South Platte Dredging Company hydraulic placer gold mining dredge near Fairplay (Park County), Colorado. Gravel tailing piles are on the ground at the end of the mechanical arm.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Fairplay (Colo.)--1930-1950.; Conveying systems--Colorado--Fairplay--1930-1950.; Dredges--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.;...
    • [between 1930 and 1950?]
    • So. Platte Drg. Co.

    • View of equipment on the South Platte Dredging Company hydraulic placer gold mining dredge probably near Fairplay (Park County), Colorado. Shows chains, cables, and iron beams.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Mining machinery--Colorado--Fairplay--1930-1950.; Fairplay (Colo.)--1930-1950.; Dredges--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.;...
    • [between 1930 and 1950?]
    • So. Platte Drg. Co.

    • View of bucket mechanisms on the South Platte Dredging Company hydraulic placer gold mining dredge near Fairplay (Park County), Colorado. Shows iron beams, cables, and buckets.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Fairplay (Colo.)--1930-1950.; Dredges--Colorado--Fairplay--1930-1950.; Dredging--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.;...
    • [between 1930 and 1950?]
    • West Port[al] CD timbering - from top of tunnel

    • Men work with metal shoring near the West Portal of the Alva B. Adams Tunnel (Continental Divide Tunnel), part of the Colorado Big Thompson project, in Grand County, Colorado
    • Colorado-Big Thompson Project (U.S.)--People--1940-1950.; Alva B. Adams Tunnel (Colo.)--1940-1950.; Grand County (Colo.)--1940-1950.; Construction--Colorado--Grand County--1940-1950.; Hydraulic facilities--Colorado--Grand County--1940-1950.;...
    • [between 1940 and 1950?]
    • So. Platte Drg. Co.

    • Mechanized buckets scoop up soil on the South Platte Dredging Company hydraulic placer gold mining dredge near Fairplay (Park County), Colorado. Shows rock filled alluvial soil, cables, iron beams, and buckets.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Fairplay (Colo.)--1930-1950.; Dredges--Colorado--Fairplay--1930-1950.; Dredging--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.;...
    • [between 1930 and 1950?]
    • So. Platte Drg. Co.

    • View of a tall iron beam structure that is part of the South Platte Dredging Company hydraulic placer gold mining dredge near Fairplay (Park County), Colorado. Shows the iron beam framework, pulleys, and cables.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Fairplay (Colo.)--1930-1950.; Dredges--Colorado--Fairplay--1930-1950.; Hoisting machinery--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.;...
    • [between 1930 and 1950?]
    • So. Platte Drg. Co.

    • View of an iron framework of machinery on the South Platte Dredging Company hydraulic placer gold mining dredge near Fairplay (Park County), Colorado. Shows cables, pulleys, and buckets.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Fairplay (Colo.)--1930-1950.; Dredges--Colorado--Fairplay--1930-1950.; Hoisting machinery--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.;...
    • [between 1930 and 1950?]
    • So. Platte Drg. Co.

    • View of an iron framework on the South Platte Dredging Company hydraulic placer gold mining dredge near Fairplay (Park County), Colorado. Shows mechanized buckets transporting dirt, cables, iron beams, and the Platte River.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Fairplay (Colo.)--1930-1950.; Conveying systems--Colorado--Fairplay--1930-1950.; Dredges--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.;...
    • [between 1930 and 1950?]
    • So. Platte Drg. Co.

    • Buckets scoop soil from the Middle Fork South Platte River bed to be processed on the South Platte Dredging Company hydraulic placer gold mining dredge near Fairplay (Park County), Colorado. Shows iron beam framework, pulleys, and cables.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Fairplay (Colo.)--1930-1950.; Dredges--Colorado--Fairplay--1930-1950.; Dredging--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.;...
    • [between 1930 and 1950?]
    • So. Platte Drg. Co.

    • Mechanized buckets lift dirt onto the South Platte Dredging Company hydraulic placer gold mining dredge probably near Fairplay (Park County), Colorado. Shows steel beam framework and cables.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Fairplay (Colo.)--1940-1950.; Conveying systems--Colorado--Fairplay--1940-1950.; Dredges--Colorado--Fairplay--1940-1950.; Dredging--Colorado--Fairplay--1930-1950.;...
    • [between 1940 and 1950?]
    • So. Platte Drg. Co., control room

    • A worker operates the controls of the South Platte Dredging Company hydraulic placer gold mining dredge probably near Fairplay (Park County), Colorado. The man sits in the control room and holds a control lever in each hand. Other control levers...
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Control rooms--Colorado--Fairplay--1930-1950.; Fairplay (Colo.)--1930-1950.; Dredges--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.;...
    • [between 1930 and 1950?]
    • So. Platte Drg. Co.

    • View of a control room with levers, switches, and dials on the South Platte Dredging Company hydraulic placer gold mining dredge probably near Fairplay (Park County), Colorado.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Control rooms--Colorado--Fairplay--1930-1950.; Fairplay (Colo.)--1930-1950.; Dredges--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.;...
    • [between 1930 and 1950?]
    • So. Platte Drg. Co.

    • View of the South Platte Dredging Company hydraulic placer gold mining dredge probably near Fairplay (Park County), Colorado. Shows dredge equipment, tailing piles, and hose.
    • South Platte Dredging Co.--Equipment & supplies--1930-1950.; Fairplay (Colo.)--1930-1950.; Dredges--Colorado--Fairplay--1930-1950.; Hydraulic mining--Colorado--Fairplay--1930-1950.; Mining--Colorado--Fairplay--1930-1950.
    • [between 1930 and 1950?]
    • EPCD, drilling from column

    • A worker operates a compressed air, percussion-type rock drill near the East Portal of the Alva B. Adams Tunnel (Continental Divide Tunnel), of the Colorado-Big Thompson Water Diversion Project, in Grand County, Colorado. The man wears a safety...
    • Alva B. Adams Tunnel (Colo.)--1940-1950.; Grand County (Colo.)--1940-1950.; Boring--Colorado--Grand County--1940-1950.; Construction workers--Colorado--Grand County--1940-1950.; Drilling & boring machinery--Colorado--Grand County--1940-1950.;...
    • [between 1940 and 1944?]

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