1968. 2012-10-11T13:56:29Z. 2013-03-13T16:27:59Z. Briggs, Reginald Peter, 1929-. U.S. Geological Survey. English. Public. Puerto Rico.
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1965. 2012-09-26T18:50:05Z. 2013-03-18T22:20:08Z. Briggs, Reginald Peter, 1929-. U.S. Geological Survey. English. Public. Puerto Rico.
1972. 2012-11-16T20:01:33Z. 2022-07-11T14:50:29Z. Briggs, Reginald Peter, 1929-. U.S. Geological Survey. English. Public. Puerto Rico.
1971. 2012-11-01T20:24:32Z. 2012-11-01T20:24:32Z. Briggs, Reginald Peter, 1929-. U.S. Geological Survey. English. Public. Puerto Rico.
1962. 2012-09-13T14:10:01Z. 2013-03-18T20:24:39Z. Briggs, Reginald Peter, 1929-. U.S. Geological Survey. English. Public. Puerto Rico.
1964. 2012-09-24T15:16:37Z. 2013-03-18T22:19:38Z. Briggs, Reginald Peter, 1929-. Dept. of the Interior, U.S. Geological Survey. English. Public. Puerto Rico.
