@book{220995,
	author = {World Data Center A for Rockets and Satellites},
	title = {Spacewarn bulletin},
	publisher = {National Space Science Data Center},
	address = {Greenbelt,Md.},
	note = {Description based on: SPX-447(Jan. 25,1991);title from title screen (viewed Apr. 12,2004).},
	url = {http://purl.access.gpo.gov/GPO/LPS47284}
}