One of the key publications of the Upper Grijalva River Basin Project, which chronicles the prehistory of the eastern Central Depression of Chiapas from Archaic to Colonial times. These two volumes present the ceramic sequence, fully illustrated with drawings and photos, and the regional chronology based on excavations from more than a dozen sites. Part 1: Introduction, Preclassic to Protoclassic periods; Part II: Early Classic to Colonial periods and References. Published by New World Archaeological Foundation.