Air Enthusiast Forty Air enthusiast forty-one Wat is dat voor een vliegtuig?1962 Observer's book of aircraft ; 1954 Observer's book of aircraft ; 1957 Observer's book of aircraft ; 1958 Observer's book of aircraft ; 1959 Observer's book of aircraft ; 1960 Observer's world aircraft directory ; 1961 Observer's book of aircraft ; 1962 Observer's book of aircraft ; 1963 Observer's book of aircraft ; 1964
