(1976). Agronomic - economic research on tropical soils. Annual report for 1975. USA: U.S.Agency for International Development.
シカゴスタイル引用形Agronomic - Economic Research On Tropical Soils. Annual Report for 1975. USA: U.S.Agency for International Development, 1976.
MLA引用形式Agronomic - Economic Research On Tropical Soils. Annual Report for 1975. USA: U.S.Agency for International Development, 1976.
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