United States. Post Office Department. (1928). Post route map of the state of Washington: Showing post offices with the intermediate distances on mail routes in operation on the 1st of January 1928. Published by order of Postmaster General Harry S. New.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)United States. Post Office Department. Post Route Map of the State of Washington: Showing Post Offices with the Intermediate Distances on Mail Routes in Operation on the 1st of January 1928. [Washington, D.C.]: Published by order of Postmaster General Harry S. New, 1928.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)United States. Post Office Department. Post Route Map of the State of Washington: Showing Post Offices with the Intermediate Distances on Mail Routes in Operation on the 1st of January 1928. Published by order of Postmaster General Harry S. New, 1928.