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- Map Collections at the Library of Congress -- These collections include scans of some of the nation's most important, and historic maps.
- Sanborn maps at the Library of Congress -- These incredibly detailed maps show the buildings in thousands of cities. Most maps date from from the late 1800s to the early 1900s. Use the list of cities & states on the left side of the screen to navigate. Golden, Colorado has 3 sets -- 1886, 1890, 1895.
- David Rumsey Collection -- Scans of historic maps from a private map collection--over 71,000 incredible images!
- University of Texas, Austin, Perry-Castañeda Library, Map Collection -- Huge selection of scanned maps that have been produced various U.S. Federal Government agencies including the USGS, National Park Service, Army Map Service, and CIA.
- Persuasive Cartography -- The PJ Mode Collection -- "This is a collection of “persuasive” cartography: more than 800 maps intended primarily to influence opinions or beliefs - to send a message - rather than to communicate geographic information. The collection reflects a variety of persuasive tools , including allegorical, satirical and pictorial mapping; selective inclusion; unusual use of projections, color, graphics and text; and intentional deception. Maps in the collection address a wide range of messages: religious, political, military, commercial, moral and social."
- CartoMundi has scanned more than 6,500 (mostly) topographic maps of world. The website is in French but has an English button. Most of the maps are in French.