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 bird monitoring data from national forests of the western Great Lakes region
- Author(s):
- Niemi, Gerald J.; Howe, Robert W.; Zlonis, Edmund J.; Grinde, Alexis R.; Parker, Linda R.; Gnass Giese, Erin E.