The Ribbon of Green: Change in Riparian Vegetation in the Southwestern United States.ByRobert H. Webb, Stanley A. Leake,and, Raymond M. Turner;principal photography by Dominic Oldershaw. Tucson (Arizona): University of Arizona Press. $75.00. xiv + 462 p.; ill.; index. 978‐0‐8165‐2588‐1. 2007.