US Air Force general Donald Putt tries out the Avro Canada Avrocar
disc aircraft before 1947
von Kármán's April 1947 Wright Brothers lecture
boeing's WWII "flapjacks"
project SIGN's saucer
"flying saucers found in maryland!"
the avro canada saucer projects
ulam's atomic saucer
soviet disc aircraft
the saucer and the harrier
"black aircraft" and ufos
claims about "antigravity" technology