Archaeological Frontiers and External Connections is the fourth volume in the Handbook of Middle American Indians, published in cooperation with the Middle American Research Institute of Tulane University under the general editorship of Robert Wauchope (1909–1979). Volume editors are Gordon R. Willey (1913–2002), Bowditch Professor of Mexican and Central American Archaeology and Ethnology at Harvard University, and Gordon F. Ekholm (1909–1987), Associate Curator of Mexican Archaeology of the American Museum of Natural History in New York.

This volume presents an intensive study of matters of significance in various areas: archaeology and ethnohistory of the Northern Sierra, Sonora, Lower California, and northeastern Mexico; external relations between Mesoamerica and the southwestern United States and eastern United States; archaeology and ethnohistory of El Salvador, western Honduras, and lower Central America; external relations between Mesoamerica and the Caribbean area, Ecuador, and the Andes; and the case for and against Old World pre-Columbian contacts via the Pacific. Many photographs accompany the text.

The Handbook of Middle American Indians was assembled and edited at the Middle American Research Institute of Tulane University with the assistance of grants from the National Science Foundation and under the sponsorship of the National Research Council Committee on Latin American Anthropology.

Archaeology of Northern Mesoamerica comprises the tenth and eleventh volumes in the Handbook of Middle American Indians, published in cooperation with the Middle American Research Institute of Tulane University under the general editorship of Robert Wauchope (1909–1979). Volume editors of Archaeology of Northern Mesoamerica are Gordon F. Ekholm and Ignacio Bernal. Gordon F. Ekholm (1909–1987) was curator of anthropology at The American Museum of Natural History, New York, and a former president of the Society for American Archaeology. Ignacio Bernal (1910–1992), former director of the Instituto Nacional de Antropología e Historia, Mexico, was director of the Museo Nacional de Antropología in Mexico and also a past president of the Society for American Archaeology.

Volumes 10 and 11 describe the pre-Aztec and Aztec cultures of Mexico, from central Veracruz and the Gulf Coast, through the Valley of Mexico, to western Mexico and the northern frontiers of these ancient American civilizations.

The thirty-two articles, lavishly illustrated and accompanied by bibliography and index, were prepared by authorities on prehistoric settlement patterns, architecture, sculpture, mural painting, ceramics and minor arts and crafts, ancient writing and calendars, social and political organization, religion, philosophy, and literature. There are also special articles on the archaeology and ethnohistory of selected regions within northern Mesoamerica.

The Handbook of Middle American Indians was assembled and edited at the Middle American Research Institute of Tulane University with the assistance of grants from the National Science Foundation and under the sponsorship of the National Research Council Committee on Latin American Anthropology.