1968. 2012-10-08T20:35:13Z. 2013-03-18T22:22:18Z. Mattson, Peter H. U.S. Geological Survey. English. Public. Puerto Rico.
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1968. 2012-10-08T20:37:12Z. 2013-03-18T22:22:18Z. Mattson, Peter H. U.S. Geological Survey. English. Public. Puerto Rico.
