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RT @USGS: #HappyBirthday to Grove Karl Gilbert! “Gilbert joined the U.S. Geological Survey on its founding in 1879 and served as its first…
RT @USGS: #HappyBirthday to Grove Karl Gilbert! “Gilbert joined the U.S. Geological Survey on its founding in 1879 and served as its first…
RT @USGS: #HappyBirthday to Grove Karl Gilbert! “Gilbert joined the U.S. Geological Survey on its founding in 1879 and served as its first…
Rock on, G.K. Rock on.
RT @USGS: #HappyBirthday to Grove Karl Gilbert! “Gilbert joined the U.S. Geological Survey on its founding in 1879 and served as its first…