@book{545697,
	author = {Noll, Edward M.},
	title = {Radio operators license handbook /},
	publisher = {H. W. Sams,},
	year = {1974.},
	address = {Indianapolis :},
	edition = {3d ed.},
	note = {Fourth ed. published in 1976 under title: Third-class radiotelephone license handbook.}
}