In preparation for the Normandy Invasion of early June 1944, the U.S. and British military prepared detailed maps of the coastline site in France. One was a three-dimensional model made of rubber depicting relief and showing tide lines, the slope of the beach, buildings, and locations of anti-landing craft systems, known as hedgehogs. The map was given to the Library of Congress by a participant in the invasion, Charles Lee Burwell, who as a naval intelligence officer during the conflict responsible for briefing Allied high command and troops.
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