@book{7744,
	author = {Institute for Telecommunication Sciences and Aeronomy. and Bean, B. R.},
	title = {A world atlas of atmospheric radio refractivity},
	publisher = {U.S. Govt. Print. Off.},
	year = {1966.},
	series = {United States. Environmental Science Services Administration. ESSA monograph},
	address = {Washington}
}