Map of the Fort Ridgely & South Pass road / by Samuel A. Medary ; drawn by John R. Key.
MLA
Medary, Samuel A. Map of the Fort Ridgely & South Pass Road / by Samuel A. Medary ; Drawn by John R. Key. Dept. of the Interior, 1858. https://collections.library.yale.edu/catalog/15814473.
APA, 6th edition
Medary, S. A. (1858). Map of the Fort Ridgely & South Pass road / by Samuel A. Medary ; drawn by John R. Key. [Maps]. Dept. of the Interior, https://collections.library.yale.edu/catalog/15814473.