Boilerplate structural Apollo CSM's were used for various systems and booster tests, especially proving of the LES (launch escape system).

• Brooks, Courtney G, Grimwood, Hames M, Swenson, Lloyd S, Chariots for Apollo, Government Printing Office, 1989. The official version - NASA's history of the Apollo program. Accessed at: http://www.hq.nasa.gov/office/pao/History/SP-4205/cover.html.

• JPL Mission and Spacecraft Library, Jet Propulsion Laboratory, 1997. Accessed at: http://msl.jpl.nasa.gov/home.html.

• McDowell, Jonathan, Jonathan's Space Home Page, Harvard University, 1997-present. Jonathan McDowell's complete on-line listing of all objects orbited and over 20,000 rocket launches Accessed at: http://www.planet4589.org/jsr.html.

• Baker, David, The History of Manned Spaceflight, Crown, New York, 1981. The best overview of America's manned space programs up to Skylab. Information and details not available anywhere else. Unfortunately out of print and difficult to locate.