My conversion is at
http://www.picotech.net/~jeff_wilson63/rpg/gur_rift.htm
There are others out their wich may appael to you more excessively depewnding on what apsects you like about the Rifts world, but I don't have the addresses.
I would suggest that you state the backgruond in whatever books you have is simply propaganda and the only way to know how things really are is to go out and look. I finally tossed Rifts altogether when I wasn't able to hold the disparate elements together and I was having things simply appear or disappear to meet the game background.