De León de Specher, A.M.Mérida González, A.K.Muralles Castro, S.P.2007-11-121986-04-012007-11-121985http://hdl.handle.net/10625/8691Texto1 fichero numérico (211 p.)application/pdfesAGRICULTURAGUATEMALABibliography