Born-Digital or AnalogAnalogTranscriptTrails. Colorado Spanish explorers in Colorado and trails they may/have traveled. Look Around v.44 #3 March 1960 Ibid v.44 #4 April 1960 Early traders and trappers who followed Platte and Arkansas Rivers in their progress thru Colorado. Look Around v.44 #6 June, 1960 p.3 Site of Warren's Ferry on Platte River in Denver describ- ed. Post July 14, 1960 p.52 c.1 Description of trails to climb, starting on the Air Force. academy grounds. Trail and Timberline #548 Aug. 1964 p.127-1.30CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng