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2017-01-30 20:54:09

Approximate location of maximum subsidence in the United States identified by research efforts of Dr. Joseph F. Poland (pictured). Signs on pole show approximate altitude of land surface in 1925, 1955, and 1977. The site is in the San Joaquin Valley southwest of Mendota, California.

Image uploaded by Karen Graham
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Personal Albums Nov 7, 2013 - Science