This list isn't in any particular order and isn't all-inclusive, but it should start you off in the right direction in your CCC research. This blog isn't intended as a way to sell books. You should be able to obtain copies of some of these books at your local library. Other books, especially the government publications can be hard to locate and an interlibrary loan may be needed if you decide you want to obtain a copy of the book in question.
Without question one of the single best books on the CCC is John Salmond's book subtitled "A New Deal Case Study," which is long out of print but which can be borrowed at local libraries and at ASU. Check back occasionally to see if new source material has been added to this list.
Louis Lester Purvis, The Ace in the Hole: A Brief History of Company 818 of the Civilian Conservation Corps (Columbus, GA: Brentwood Christian Press, 1989)
Alfred Emile Cornebise, The CCC Chronicles: Camp Newspapers of the Civilian Conservation Corps, 1933-1942 (Jefferson, NC: McFarland & Co. 2004)
John A. Salmond, The Civilian Conservation Corps, 1933-1942: A New Deal Case Study (Durham: Duke UP, 1967)
Peggy Sanders, The Civilian Conservation Corps In and Around the Black Hills (Charleston, SC: Arcadia Publishing, 2004)
Leslie Alexander Lacy, The Soil Soldiers: The Civilian Conservation Corps in the Great Depression (Radnor [Pa.]: Chilton Book Co., 1976)
United States, Department of Agriculture, The Forest Service and The Civilian Conservation Corps: 1933-42, FS-395 (Washington: GPO, 1986)
Christine E. Savage, New Deal Adobe (Santa Barbara: Fithian Press, 1991)
Kathy Mays Smith, Gold Medal CCC Company 1538: A Documentary, (Paducah, KY: Turner Pub., 2001)
Larry N. Sypolt, Civilian Conservation Corps: A Selectively Annotated Bibliography (Westport, Conn.: Praeger, 2005)
Robert J. Moore, The Civilian Conservation Corps in Arizona’s Rim Country: Working in the Woods, (Las Vegas: Univ. Of Nevada Press, 2006)
Renee Corona Kolvet & Victoria Ford, The Civilian Conservation Corps in Nevada, (Las Vegas: Univ. Of Nevada Press, 2006)