Creator
- Harder, E.C.5
- Hemstad, Chris B.5
- Hoffman, J. H. (John H.)5
- Ikola, Rodney J.5
- Johnston, A. W. (A. Walfred)5
- Kirk, Fred W.5
- Knight, Joe F.5
- Krueger, Harold W.5
- McGinnis, Lyle D. (Lyle David), 1931-20175
- Nier, Alfred O. (Alfred Otto), 1911-19945
- Rampi, Lian P.5
- United States. Bureau of Chemistry and Soils5
- Zhang, Hua (Geologist)5
- Chapman, Silas4
- Chen, Wei4
- Cooley, George Washington (1845-1920)4
- Cram, George Franklin, 1841-19284
- Host, Trevor K.4
- Jewett & Son4
- Levinson, David M.4