id	domain	url
ap-1310	lheawww.gsfc.nasa.gov	http://lheawww.gsfc.nasa.gov/users/corbet/pulsars/)
ap-1310	space.mit.edu	http://space.mit.edu/xte)
ap-1310	www.johnstonsarchive.net	http://www.johnstonsarchive.net/relativity