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  1. 31
    by Joffe, Jacob Samuel 1887-
    Published 1949
    Book

    Pedology
  2. 32
    by Jenkins, D S
    Published 1946
    Book

    The origin, distribution, and airphoto identification of United States soils. With special reference to airport and highway engineering, by D. S. Jenkins [and others].
  3. 33
    Published 1945
    Book

    Agricultural geography of the Philippine Islands, a graphic summary
  4. 34
    by Kellogg, Charles Edwin 1902-
    Published 1941
    Book

    The soils that support us; an introduction to the study of soils and their use by men
  5. 35
    by Jenny, Hans 1899-
    Published 1941
    Book

    Factors of soil formation; a system of quantitative pedology
  6. 36
    by Ayres, Quincy Claude 1891-
    Published 1939
    Book

    Land drainage and reclamation
  7. 37
    by Ayres, Quincy Claude 1891-
    Published 1936
    Book

    Soil erosion and its control
  8. 38
    by Whitford, Harry Nichols 1872-
    Published 1911
    Book

    The forest of the Philippines ..
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