Far travelers : the exploring machines / Oran W. Nicks
Published
Washington, D.C. : Scientific and Technical Information Branch, National Aeronautics and Space Administration : For sale by the Supt. of Docs., U.S. G.P.O., 1985
No longer available for sale by the Supt. of Docs., U.S. G.P.O
Also available via Internet from the NASA History Office web site. Address as of 6/6/06: http://history.nasa.gov/SP-480/sp480.htm; current access is available via PURL