design research:

Precolombian Architecture in Eastern North America is the most comprehensive study today of the ancient architecture created by Native Americans during the six thousand year period preceding the arrival of Columbus. Beginning with extraordinary earthworks at such sites as Watson Break and Poverty Point in Louisiana, the study continues with an analysis of remarkable sites in the Ohio Valley around the beginning of the Christian era, and culminates with exceptional temple towns of the Mississippi Valley that continued to be built until the time of European contact.

"An invaluable, splendidly illustrated overview of the grand construction projects of the precolumbian inhabitants of Eastern North America" Eduard F. Sekler, professor emeritus of architecture, Harvard University.