Bob Audretsch—historian, writer, and former National Park Service ranger at Grand Canyon— has just published a book about the work of the CCC at Grand Canyon: Shaping the Park and Saving the Boys: The Civilian Conservation Corps at Grand Canyon, 1933-1942. Information on the book and the author can be found at http://cccbooks.org/. The book is available at Ingram, Amazon.com, Barnes & Noble and fine bookstores everywhere.