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This was the first of a series of six expeditions into what was to become Yellowstone National Park. This was a privately funded expedition and consisted of David E. Folsom, Charles W. Cook, and William Peterson. The expedition started near the Three Forks of the Missouri, crossed Bozeman Pass, ascended the Yellowstone River to Yellowstone Lake, and then returned to Virginia City by following the Madison River. The men kept a journal of their observations from which Folsom wrote an excellent article. This journal has been reconstructed by a later author.

Brown, M.H.  1969.  The plainsmen of the Yellowstone: A history of the 
     Yellowstone Basin.  Bison Books, Univ. of Nebraska Press, Lincoln.

Chittenden, H.M.  1985.  The Yellowstone National Park.  The Robert Clark 
     Co., Cincinnati, OH.

Folsom, D.E.  1894.  Folsom-Cook exploration of the upper Yellowstone in 
     the year 1869.  St. Paul, MN.

Haines, A.L.  1965.  The valley of the upper Yellowstone: An exploration 
     of the headwaters of the Yellowstone River in the year 1869.  The 
     journal of Charles W. Cook, David E. Folsom, and William Peterson.  
     Univ. of Oklahoma Press, Norman.  80 pp [This book contains an 
     excellent bibliography detailing the sources for the reassembled 
     journal]

Schullery, P. and L Whittlesey.  1992.  The documentary record of wolves 
     and related wildlife in the Yellowstone National Park area prior to 
     1882.  Pages 1-4 to 1-174 in Varely, J.D. and W.G. Brewster, 
     eds., Wolves for Yellowstone?  A report to the United States 
     Congress, Volume IV research and analysis.  National Park Service, 
     Yellowstone National Park, WY. [This report is a definitive account 
     of wildlife and habitat conditions in the Park prior to 1882.  It 
     contains detailed summaries of all visitors to the Park area during 
     this time period who left a written record.  The bibliography of this 
     publication contains over 220 citations.  It is highly recommended 
     that anyone desiring information about the early history of the 
     Yellowstone Park area obtain a copy of this report.  (Our report only 
     includes summaries of the major expeditions to Yellowstone.)]