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Geographical Sources

Library of Congress
It has custody of the largest and most comprehensive cartographic collection in the world with collections numbering over 5 million maps, 100,000 atlases, 8,000 reference works, over 5000 globes and globe gores, 3,000 raised relief models, over 130,000 microfiche/film, and a large number of cartographic materials in other formats.
David Rumsey Map Collection
Focuses on 16th through 21st century maps of North and and South America, as well as maps of the World, Asia, Africa, Europe, and Oceania. The collection includes atlases, globes, school geographies, maritime charts, and a variety of separate maps including pocket, wall, children's and manuscript maps.
The easy-to-use getaway to historical maps in libraries around the world. It aims to demonstrate a combination of tools for publishing historical maps with a focus on their easy accessibility for the general public. 
Old Maps Online