Map showing Northern Pacific Railway System, Chicago, Burlington & Quincy R.R. system, Spokane, Portland & Seattle Railway and its subsidiary lines ... Spokane & Inland Empire Railroad, [and] Colorado & Southern Railway System.
MLA
Map Showing Northern Pacific Railway System, Chicago, Burlington & Quincy R.R. System, Spokane, Portland & Seattle Railway and Its Subsidiary Lines ... Spokane & Inland Empire Railroad, [and] Colorado & Southern Railway System. McGill-Warner Co., 0AD. https://collections.library.yale.edu/catalog/15813039.
APA, 6th edition
Map showing Northern Pacific Railway System, Chicago, Burlington & Quincy R.R. system, Spokane, Portland & Seattle Railway and its subsidiary lines ... Spokane & Inland Empire Railroad, [and] Colorado & Southern Railway System. (0 C.E.). [Maps]. McGill-Warner Co., https://collections.library.yale.edu/catalog/15813039.