Scope and Contents of the Collection
Four major surveys (King, Powell, Hayden, Wheeler) of the geography and geology of the western United States were authorized by the US government in the years after the Civil War. The King Survey was established by Congress (Acts of March 2, 1867) in the Office of the Chief of Engineers, War Department; the Wheeler Survey was officially established by Congress (Act of June 10, 1872). This majority of photographic prints in this collection were taken by Timothy H. O'Sullivan for...
1867 - 1872