1. Historical maps of land use in Puerto Rico in 1951
- Author(s):
- Helmer, Eileen H.; Córdova, Juan R.; Quiñones, Maya; Hubing, Nick
2. Base data for three focal landscapes in Wisconsin used for grassland bird conservation
- Author(s):
- Ribic, Christine A.; Guttery, Michael R.; Sample, David W.; Schneider, Daniel; Paulios, Andy; Dadisman, John; Horton, Josephine A.; Trosen, Christopher