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  1. 1

    The use of guano as an organic fertilizer and its implications of science teaching par Acain, Virgilio Hynson 1942-

    Publié 1976
    Thèse

    The use of guano as an organic fertilizer and its implications of science teaching
  2. 2

    Limestone and guano resources of southern Cotabato and Maramag, Bukidnon par Francisco, Felipe U.

    Publié 1953
    Livre

    Limestone and guano resources of southern Cotabato and Maramag, Bukidnon

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