1963. 2011-05-17T13:33:37Z. 2012-02-14T00:28:11Z. Monroe, Watson Hiner, 1907-. The Survey. English. Public. Puerto Rico.
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1963. 2011-05-13T15:54:13Z. 2012-02-14T23:33:51Z. Monroe, Watson Hiner, 1907-. U.S. Geological Survey. English. Public. Puerto Rico.
