Drainage Map, showing a portion of Wyoming, Idaho and Utah, 1879, surveyed by the United States Geological and Geographical Survey of the Territories. Primary triangulation by AD Wilson; Topography by Henry Gannett, GB Chittenden, Gustavus R Bechler and FA Clark.

Photograph of a team of draught horses pulling a plough driven by one man while another works to remove rock and soil from one of the American Museum [of Natural History?] quarries in central Wyoming in the early/mid 20th century.

Map of Montana and Wyoming Territories, embracing most of the country drained by the Madison, Gallatin and Upper Yellowstone rivers. Geology by FV Hayden, assisted by AC Peale. Drawn by Henry Gannett from notes and sketches by Adolph Bruck, chief topographer of the Yellowstone Division of the United States Geological Survey of the Territories.