by John Wesley Powell
by Edwin James, Stephen H. (Stephen Harriman) Long, Thomas Say
by Noah Brooks
by Frederick Samuel Dellenbaugh
by John Charles Frémont
by Edwin James, Stephen H. (Stephen Harriman) Long, Thomas Say
by Edwin James, Stephen H. (Stephen Harriman) Long, Thomas Say
by Frederick Schwatka
by Henry Rowe Schoolcraft
by Edwin James, Stephen H. (Stephen Harriman) Long, Thomas Say