[Air-l] usenet historiography question

Hi Everyone, I'm trying to trace the development of a FAQ on MPEG that circulated on usenet starting in 1994. I've done a search on google groups but I'm wondering if there is a more powerful or definitive tool. Google seems pretty hit or miss as I can find some stuff from that period, but there are other things from 1994 that I know were there then that I can't find now. I'd appreciate suggestions from anyone who's doing usenet history. Thanks. --Jonathan