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Maps - Thematic
Data Snapshots: Reusable Climate Maps
From the U.S. National Oceanographic and Atmospheric Administration.
Earth Sciences & Map Library Digital Collection
From the University of California Berkeley. Mostly earth sciences and geology related.
Historical Map and Chart Collection - U.S. Coast Guard
"...Covers the land and waters of the United States of America, including territories and possessions (past and present)."
National Geographic Maps
Both thematic ("EarthPulse") and political ("Atlas Explorer") maps of the world.
Negro Motorist Green Book, 1949
"The GREEN BOOK with its list of hotels, boarding houses, restaurants, beauty shops, barber shops and various other services can most certainly help solve your travel problems. It was the idea of Victor H. Green, the publisher, in introducing the Green Book, to save the travelers of his race as many difficulties and embarrassments as possible.”
From Princeton University: "...more than 800 maps intended primarily to influence opinions or beliefs - to send a message - rather than to communicate geographic information."