World Aviation
SANTOS, Enrique B.
Trails in Philippine Skies - A History of Aviation in the Philippines from 1909 to 1941
SCHILLING, Franz & RETTINGHAUS, Helmut
Die Geschichte der Luftpolizei
Flugzeug Dokumentation
SMITH, Henry Ladd
Airways
The History of Commercial Aviation in the United States
Early history of US civil aviation first published in 1942. Text supported by photographs and appendices.