Marie Tharp and Bruce Heezen were oceanographers, cartographers and geologists at the Lamont-Doherty Earth Science Observatory of Columbia University from the late 1940s to 1977. Marie Tharp's papers in the Geography and Map Division contain more than 32,000 pieces including a handmade globe of the earth showing the ocean floor and the location of the mid-Atlantic Ocean ridge. This globe served to reveal positive data regarding the concept of continental drift and plate tectonics.
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