USGS: U.S. Geological Survey [online], 2013-. http://www.usgs.gov (13 September 2013).
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sourceNonPreferred
used
USGS: U.S. Geological Survey [online], 2013-. http://www.usgs.gov (13 September 2013).
license
identifier
2000076487
created
2013-09-13T11:08:31
license
title
USGS: U.S. Geological Survey [online], 2013-. http://www.usgs.gov (13 September 2013).
shortTitle
USGS [online] (2013-)