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. 1936 control survey map of Berkeley County, South Carolina
- Author(s):
- Arnold, Julie A.