Author
- Atkinson, C. H. (Cuthbert Harry), 1906- 1 results
- Burke, R. T. Avon 1 results
- Burke, R. T. Avon (Richard Thomas Avon), 1878- 1 results
- Burke, R. T. Avon, 1878- 1 results
- Hosterman, James L., 1909- 1 results
- Marshall, R. M. (Richard Moon), 1907- 1 results
- Pennsylvania State College. School of Agriculture 2 results
- Simmons, C. S. (Charles Shaffer), 1900- 1 results
- United States. Bureau of Chemistry and Soils
- United States. Soil Conservation Service 1 results