General Aircraft
TAYLOR, Michael J.H. (ed.)
Jane's Encyclopedia of Aviation
Directory of worldwide aircraft types, listed alphabetically by manufacturer. History and details of each type, with photographs throughout. Originally published in five parts, a very large combined volume appeared in 1980 with additional material.
The Aeroplane
The Aeroplane Directory of British Aviation 1953
incorporating Who's Who in British Aviation
The Aeroplane
The Aeroplane Directory of British Aviation 1966
incorporating Who's Who in British Aviation
Vertical Lift Aircraft Council
Directory of Helicopter Operators in the United States and Canada
Directory listing of each operator with the type and number of helicopters as at 1969 - a total of 3,433.