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2by Aristorenas, I.J., Department of Agriculture and Natural Resources, Manila (Philippines). Bureau of Soils eng, Romero, I.A., Salazar, F.G.
Published 1963Texto bibliotecaFAO IT -
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6by Lucas, L., Department of Agriculture and Natural Resources, Manila (Philippines). Bureau of Soils eng, Mojica, A.E., Engle, L., Salazar, F.G.
Published 1965Texto bibliotecaFAO IT -
7by Barrera, A., Department of Agriculture and Natural Resources, Manila (Philippines). Bureau of Soils eng, Dingayan, A.B., Rodriquez, A., De La Cruz, J., Santos, R.L.
Published 1969Texto bibliotecaFAO IT