MLA

Matthews-Northrup Company, Northern Pacific Railroad Company. Sectional Land Map Showing the Lands of the Northern Pacific Railroad Co. in Western Washington and Northern Oregon : with Condensed Information Relating to the Pacific Northwest. [Northern Pacific Railroad Company], 0AD. https://collections.library.yale.edu/catalog/2043512.

APA, 6th edition

Matthews-Northrup Company, N. P. R. C. (0 C.E.). Sectional land map showing the lands of the Northern Pacific Railroad Co. in western Washington and northern Oregon : with condensed information relating to the Pacific Northwest [Maps, Promotional literature]. [Northern Pacific Railroad Company]. https://collections.library.yale.edu/catalog/2043512.