Colorado River: Lees Ferry, Arizona, to Lake Mead, through Marble & Grand Canyons, 288 miles. Highly detailed, easy-to-read maps. Illustrated sections on geology, natural history and archaeology, written by experts in these fields. Trip enrichment sections including a photo workshop and a section on how rivers and rapids work. Dramatically illustrated with full color diagrams and photographs. Now with USGS GCMRC miles.  (USW646, $22.00)