Soil erosion by water : some measures for its control on cultivated lands. - xxi, 284 páginas : ilustraciones, tables y figure a blanco y negro ; 23 cm. - Agricultural Development Paper ; 81 . - FAO. Agricultural Development Paper . Subjects--Topical Terms: Erosión del suelo.Conservación de suelos. LC Class. No.: S 623 .S65 1965 Universal Decimal Class. No.: S 623 / .S65 1965