Joe Hill wrote: Are there seconstructed proto-Centum and proto-Satem languages? If so, is there anywhere I can find information on them? Aside from (satem) Proto Indo-Iranian, I doubt it. The other centum/satem languages reflect independent development, I think (IE is not my field). Two very useful IE websites: http://babaev.newmail.ru/indexxx.html -- this is, I think, "The Indo European Database" -- and a mailing list http://groups.yahoo.com/group/cybalist/ -- I hope that works; otherwise find the "yahoogroups" site and enter "cybalist"in the search box. I think you have to join (no big deal) in order to read the messages. (11,000-plus archived) You could post your question to Cybalist and get an authoritative answer.