1. Post route map of Porto Rico : showing post offices with the intermediate distances on mail routes Creator: United States. Post Office Dept Published / Created: 1912 Call Number: 856gmd 1912 Container / Volume: BRBL_00643 Image Count: 1 Resource Type: Maps, Atlases & Globes Description: Includes "List of districts in Porto Rico showing the relative position of each District on the Island." Publisher: U.S. Post Office Dept., Subject (Geographic): Puerto Rico--Maps Subject (Topic): Postal service--Puerto Rico--Maps Found in: Beinecke Rare Book and Manuscript Library > Post route map of Porto Rico : showing post offices with the intermediate distances on mail routes in operation on the 1st of December 1912 / published by order of Postmaster General Frank H. Hitchcock.