| Douglas Helms - Boll weevil - 2012 - 735 pages
"[A] collection of writings of Douglas Helms on topics ranging from the history of the cotton boll weevil and the soils of the South to the history of soil and water ... | |
| Electronic books - 1984 - 90 pages
Soil taxonomy: its evolution, status and future; The role of soils classification in research planning; The role of soils classification in technology transfer; The U.S. system ... | |
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