00287nam a2200109Ia 450000500170000008000180001710000210003524500650005626000270012130000100014858300190015820260716043138.0  a07.07.02 H565  aHerrera, Danielo  aEl comercio interregional de granos basicos en Centroamerica  bIICAaSan JoseCRc1992  a168p.  c3/7/00kM2LMGR