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1. Historical maps of land use in Puerto Rico in 1951 Data publication contains GIS data

Author(s):
Helmer, Eileen H.; Córdova, Juan R.; Quiñones, Maya; Hubing, Nick

2. Puerto Rico, Vieques and Culebra land cover and forest formations circa 2000 Data publication contains GIS data

Author(s):
Kennaway, Todd A.; Helmer, Eileen H.