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  1. 11
    Published 1988
    Book

    Trace elements and heavy metals in soils and plants of the Southeast Asian Metropolis, Metro Manila and of some rice cultivation provinces in Luzon, Philippines
  2. 12
    Published 1988
    Book

    Soil taxonomy key to effective land use : proceedings of the fourteenth International Forum on Soil Taxonomy and Agrotechnology transfer, June 16-27, 1986, PCARRD headquarters, Los Banos, Laguna.
  3. 13
    Published 1979
    Book

    Reconnaissance land resources survey of the Agusan River Basin
  4. 14
    Published 1979
    Book

    Nitrogen and rice
  5. 15
    Published 1978
    Book

    The Philippines recommends for soil fertility management
  6. 16
    Published 1978
    Book

    Integration of soil conservation concepts in the school curriculum.
  7. 17
    Published 1978
    Book

    Soils and rice.
  8. 18
    Published 1977
    Book

    The Philippines recommends for soil conservation 1977
  9. 19
    by Barrera, Alfredo
    Published 1977
    Book

    Principles of soil science
  10. 20
    Published 1970
    Book

    Proceedings [of a] Seminar-Workshop on Soils and Fertilizers
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