Geology of Puerto Rico - USGS
Geology, Geochemistry, Geophysics, Mineral Occurrences and Mineral Resource Assessment for the Commonwealth of Puerto Rico. Bawiec, Walter J. (editor), 1998, Geology, Geochemistry, Geophysics, Mineral Occurrences and Mineral Resource Assessment for the Commonwealth of Puerto Rico: U.S. Geological Survey Open-File Report 98-38, https://doi.org ...