Greenland, D. J. Characterization of soils in relation to their classification and management for crop production; examples from some areas of the humid tropics - Oxfor : Clarendon, 1981 - 446 p. : láms. ; gráfs LCCN: 15244 Subjects--Topical Terms: Suelos agrícolas.Suelos tropicales.Suelos--Clasificación. Dewey Class. No.: 631.44 / G7