Library of Congress | Geography & Map Reading RoomThe Geography and Map Division (G&M) of the Library of Congress 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. Click on Online Collections to find the almost 38,000 maps that have been digitized.