These are levels that were created for a contest held by Newdoom and Judged by John Romero. It might also have been hosted by Doomcenter. I can't really remember now but I'm 80% certain it was Newdoom.com.  Anyway - each level is represented below by the opening screenie so if you recognize it and know who built it or you think you were involved but not sure - get the download and see. If you were, send me an email and once I have all I'm going to get I'll create a text file for it.