1. A geological reconnaissance in southwestern Kansas Author/Creator: Hay, Robert, 1835-1895, author Publication/Creation: Washington, D.C. : Department of the Interior, United States Geological Survey, 1890 Resource Type: Book Access & Availability: Loading
2. The glaciation of the Yellowstone valley, north of the park Author/Creator: Weed, Walter Harvey, 1862-1944, author Publication/Creation: Washington, D.C. : Department of the Interior, United States Geological Survey, 1893 Resource Type: Book Access & Availability: Loading