Post route map of the State of Colorado showing post offices with the intermediate distances on mail routes in operation on the 1st of Sept. 1897

Chicago citation style
United States, Post Office Department. Post route map of the State of Colorado showing post offices with the intermediate distances on mail routes in operation on the 1st of Sept. 1897. 1897. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/4m90fj413. (Accessed June 22, 2018.)
APA citation style
United States, Post Office Department, (1897) Post route map of the State of Colorado showing post offices with the intermediate distances on mail routes in operation on the 1st of Sept. 1897. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/4m90fj413
MLA citation style
United States, Post Office Department. Retrieved from the Digital Public Library of America <http://ark.digitalcommonwealth.org/ark:/50959/4m90fj413>.
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