Air Progress March 1972 Cessna Motorhome Comparison Magazine Aviation

Air Progress December 1972 Hanggliders Short-Field Landings Magazine Aviation

Air Progress Magazine January 1972 Erich Hartmann Hippies Flying Aviation

Air Progress Magazine October 1972 BD-5 First Flight Test Results Aviation

Air Progress April 1972 SAAB 105XT Fighter Magazine Aviation History

Air Progress Magazine / June 1972 / World's Fastest Swift / Piper Arrow II

Air Progress Magazine June 1968 Beechcraft Staggerwing Aviation Aircraft

Air Progress Magazine June 1970 P-51 Interceptor Aviation History