1. John Wesley Powell's exploration of the Colorado River Author/Creator: Geological Survey (U.S.) Publication/Creation: [Washington] : [for sale by the Supt. of Docs., U.S. Govt. Print. Off], [1974] Resource Type: Book Access & Availability: Loading
2. John Wesley Powell's exploration of the Colorado River Author/Creator: Rabbitt, Mary C. Publication/Creation: Washington, D.C. : U.S. Dept. of the Interior, U.S. Geological Survey, [1995?] Resource Type: Book Access & Availability: Loading