1. Historical maps of land use in Puerto Rico in 1951
- Author(s):
- Helmer, Eileen H.; Córdova, Juan R.; Quiñones, Maya; Hubing, Nick
2. Forest carbon data for the 2008 US forest national greenhouse gas inventory
- Author(s):
- Smith, James E.; Heath, Linda S.; Patel, Amit R.
U.S. Department of Agriculture