Cite

Sectional map of Nebraska Territory / compiled from the field notes in the Surveyor General's Office by Robert L. Ream.

MLA

Ream, Robert L. Sectional Map of Nebraska Territory / Compiled from the Field Notes in the Surveyor General's Office by Robert L. Ream. E. Mendenhall, 1857. https://collections.library.yale.edu/catalog/15814771.

APA, 6th edition

Ream, R. L. (1857). Sectional map of Nebraska Territory / compiled from the field notes in the Surveyor General's Office by Robert L. Ream. [Maps]. E. Mendenhall, https://collections.library.yale.edu/catalog/15814771.