1. Soil classification in the United States;Ableiter;Soil Sci.,1949
2. Soil fertility and its health implications;Albrecht;Am. J. Orthod. Oral Surg.,1945
3. Pattern of caries in relation to the pattern of soil fertility in the United States;Albrecht;Dent. J. Aust.,1951
4. American state geological surveys, 1820–1845;Aldrich,1979
5. Philosophical developments in pedology in the United States: Eugene Hilgard and Milton Whitney;Amundson,2006