Rounded and curved rocks eroded by South Platte River in Platte Canyon, Colorado reached via Colorado and Southern Railway.
Platte Canyon (Colo.)--1900-1920.; South Platte River (Colo. and Neb.)--1900-1920.; Canyons--Colorado--1900-1920.; Erosion--Colorado--1900-1920.; Narrow-gage railroads--Colorado--1900-1920.; Rocks--Colorado--1900-1920.; Colorado and Southern...
[between 1900 and 1920]
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