Cite

Map of Nebraska, showing the Union Pacific Railroad land grant.

MLA

Map of Nebraska, Showing the Union Pacific Railroad Land Grant. s.n., 186AD. https://collections.library.yale.edu/catalog/15814807.

APA, 6th edition

Map of Nebraska, showing the Union Pacific Railroad land grant. (186 C.E.). [Maps]. s.n., https://collections.library.yale.edu/catalog/15814807.