1. Historical maps of land use in Puerto Rico in 1951
- 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
- Author(s):
- Kennaway, Todd A.; Helmer, Eileen H.
3. Shapefiles containing potential areas for agriculture, forestry, and conservation in Puerto Rico
- Author(s):
- Gould, William A.; Wadsworth, Frank H.; Quiñones, Maya; Fain, Stephen J.; Álvarez-Berríos, Nora L.