@book{21015,
	author = {Cushman, Frank, and Klinefelter, Cyril Faivre,},
	title = {Vocational training for airplane mechanics and aircraft engine mechanics: tentative partial analyses of the trades with suggestions relative to the organization and operation of training courses.},
	publisher = {U.S. Govt. print. off.,},
	year = {1930].},
	address = {[Washington,}
}