Electronic reproduction. Colorado Springs, Colo. : U.S. Air Force Academy. Mode of access: Internet from the Academy web site. Address as of 1/31/05: http://peregrine.usafa.af.mil/uhtbin/cgisirsi/x/0/0/520/USAFABib72-82.pdf?user%5Fid=PILOT; current access is available via PURL.