@book{92384,
	author = {United States.},
	title = {Amplifiers and heterodynes ...},
	publisher = {Govt. Print. Off.,},
	year = {1922.},
	series = {Radio communication pamphlet},
	address = {Washington,},
	note = {On verso of t.-p.: War department. Document no. 1092. Office of the Adjutant General.}
}