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  1. 1
    Soil fertility and organic matter as critical components of production systems : proceedings of a symposium /
    Published 1987
    Book
  2. 2
    Chemistry of soil organic matter /
    by Kumada, Kyōichi, 1921-
    Published 1987
    Book
  3. 3
    Soil organic matter and biological activity /
    Published 1985
    Book
  4. 4
    Pay dirt ; farming & gardening with composts /
    Book
  5. 5
    Chemicals, humus, and the soil ; a simple presentation of contemporary knowledge and opinions about fertilizers, manures, and soil fertility.
    by Hopkins, Donald Percy, 1909-
    Published 1948
    Book
  6. 6
    An agricultural testament /
    by Howard, Albert, Sir, 1873-1947
    Published 1940
    Book
  7. 7
    Chemicals, humus, and the soil ; a simple presentation of contemporary knowledge and opinions about fertilizers, manures, and soil fertility /
    by Hopkins, Donald P.
    Published 1945
    Book
  8. 8
    The formation of vegetable mould through the action of worms, with observations on their habits /
    by Darwin, Charles, 1809-1882
    Published 1945
    Book
  9. 9
    The formation of vegetable mould, through the action of worms : with observations on their habits /
    by Darwin, Charles, 1809-1882
    Published 1890
    Book
  10. 10
    Humus chemistry : genesis, composition, reactions /
    by Stevenson, F. J.
    Published 1982
    Book
  11. 11
    Study week on organic matter and soil fertility. April 22-27, 1968.
    Published 1969
    Conference Proceeding Book
  12. 12
    Microorganisms and organic matter of soils /
    Published 1970
    Book
  13. 13
    Nitrogen and soil organic matter : proceedings of a conference organized by the soil scientists of the National Agriculture Advisory Service, October 22nd-23rd 1964.
    Published 1969
    Book
  14. 14
    Soil organic matter and its role in crop production.
    Book
  15. 15
    Humic substances in the environment /
    by Schnitzer, M.
    Published 1972
    Book
  16. 16
    Soil organic matter studies : proceedings of a symposium ... /
    Published 1977
    Conference Proceeding Book
  17. 17
    Darwin on humus and the earthworm ; the formation of vegetable mould through the action of worms with observations on their habits /
    by Darwin, Charles, 1809-1882
    Published 1966
    Book
  18. 18
    Soil organic matter, its nature, its role in soil formation and in soil fertility /
    Book
  19. 19
    Physical and chemical characteristics of aquatic humus /
    by Gjessing, Egil T., 1932-
    Published 1976
    Book
  20. 20
    Aquatic and terrestrial humic materials /
    Published 1983
    Conference Proceeding Book
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