Title from title screen (viewed on June 28, 2007).
"December 1967, number 4."
Mode of access: Internet from the U.S. Air Force Academy web site. Address as of 6/28/07: http://peregrine.usafa.af.mil/uhtbin/cgisirsi/x/0/0/520/SpBib39.pdf?user%5Fid=PILOT; current access is available via PURL.