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Usage of Combined Airman Certification by Active Airmen
Charles F. Booze
其他書名
An Active Airman Population Estimate
出版Federal Aviation Administration, Office of Aviation Medicine, 1968
URLhttp://books.google.com.hk/books?id=WdH--THHcl4C&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN