U.S. geographical surveys west of the 100th meridian. Map showing routes of the river and land parties engaged in exploring the Grand Canyon of the Ccolorado. Under the command of 1st. Lieut. Geo. M. Wheller, corps of engineers, U.S. army. 1871. P.W. Hamm
MLA
The Graphic Co. Photo.-Lith., New York, et al. U.S. Geographical Surveys West of the 100th Meridian. Map Showing Routes of the River and Land Parties Engaged in Exploring the Grand Canyon of the Ccolorado. Under the Command of 1st. Lieut. Geo. M. Wheller, Corps of Engineers, U.S. Army. 1871. P.W. Hamm. 0AD. https://collections.library.yale.edu/catalog/2016088.
APA, 6th edition
The Graphic Co. Photo.-Lith., N. Y., New York, W., T., & Del., L. (0 C.E.). U.S. geographical surveys west of the 100th meridian. Map showing routes of the river and land parties engaged in exploring the Grand Canyon of the Ccolorado. Under the command of 1st. Lieut. Geo. M. Wheller, corps of engineers, U.S. army. 1871. P.W. Hamm [Photomechanical prints]. https://collections.library.yale.edu/catalog/2016088.
