Image: 1977 Geologic Map of San Juan Quadrangle, Puerto Rico
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Description: Geologic map of the San Juan quadrangle, Puerto Rico
Title: 1977 Geologic Map of San Juan Quadrangle, Puerto Rico
Credit: https://ngmdb.usgs.gov/Prodesc/proddesc_8882.htm
Author: U.S. Geological Survey
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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