Progress-report upon Geographical and geological explorations and surveys west of the one hundredth meridian, in 1872, under the direction of Brig. :
Gen. /
A. A. Humphreys, chief of engineers, United States army.

APA Citation

Geographical Surveys West of the 100th Meridian (U.S.)., Wheeler, G. M. (George Montague). (1874). Progress-report upon Geographical and geological explorations and surveys west of the one hundredth meridian, in 1872, under the direction of Brig.: Gen.. Washington: Govt. print. off..

MLA Citation

Geographical Surveys West of the 100th Meridian (U.S.), and George M. (George Montague) Wheeler. Progress-report Upon Geographical And Geological Explorations And Surveys West of the One Hundredth Meridian, In 1872, Under the Direction of Brig.: Gen.. Washington: Govt. print. off., 1874.