For 60 million years, the Gila River, longer than the Hudson and the Delaware combined, has shaped the ecology of the Southwest from its source in New Mexico to its confluence with the Colorado River in Arizona. This richly documented history of the Gila from its geological origins to the present was first published in 1994 and is now available only front UNM Press. Copyright (C) Muze Inc. 2005. For personal use only. All rights reserved.