A precious liquid : drinking water and culture in the Valley of Mexico / Michael C. Ennis-McMillan. Ennis-McMillan, Michael C. Ethnology Mexico La Purificación Tepetitla. Indigenous peoples Ecology Mexico La Purificación Tepetitla. GN564.M6 E55 2006 363.61 ENP Includes bibliographical references and index. Belmont, CA : Thomson Wadsworth, c2006. c2006. 2006 Text xvi, 155 p. : http://www.loc.gov/catdir/toc/fy0610/2005935300.html http://www.loc.gov/catdir/enhancements/fy1302/2005935300-b.html http://www.loc.gov/catdir/enhancements/fy1302/2005935300-d.html eng Case studies on contemporary social issues Mexico La Purificación Tepetitla. Mexico La Purificación Tepetitla.