1. Historical maps of land use in Puerto Rico in 1951
- Author(s):
- Helmer, Eileen H.; Córdova, Juan R.; Quiñones, Maya; Hubing, Nick
2. Nebraska windbreaks original plantings (1935-1942)
- Author(s):
- Carman, Richard; Kellerman, Todd A.
3. Timber survey data from 1911 in the Greenhorn Mountains, Sequoia National Forest
- Author(s):
- Stephens, Scott L.; Lydersen, Jamie M.; Collins, Brandon M.; Fry, Danny L.; Meyer, Marc D.