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Estudio General de Suelos, Para Fines Agricolas, de los Municipios de Pereira, Marsella, Santa Rosa de Cabal, La Virginia, Belen de Umbria, Belalcazar, Anserma, Risaralda Y Viterbo. (Departamentos de Risaralda y Caldas). Vol. X, no. 5. (+ 1 map) [Monograph]
Herrera, V. \ Velasco, F. \ Esitia, M. \ 1974
computer techniques - erosion - soil conservation - Colombia
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El Salvador. Acelhuate Catchment. Land Capability, map 4.1 [Map]
Velasco, U.P. \ Ramos, F.A. \ (et al.) \ 1981
land use - soil suitability - soil classification - Central America - Caribbean - El Salvador
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El Salvador. Acelhuate Catchment. Soils, map 2.5 [Map]
Velasco, U.P. \ Ramos, F.A. \ (et al.) \ 1981
water - topography - soil - Central America - Caribbean - El Salvador
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