You want a credits.txt for files I didn't make? Fine!
Pictures XXX-YYY were submitted by Imperator Fyron. They were not made by him. He downloaded them during the summer of 2001 from the Shrapnel graphics modifications forum. They were in a zip file entitled "seplanetsver071.zip". The file had no readme or credits.txt in it. A search of the old files forum yielded no results as to who originally posted them. If you know who made them, please tell us so we can give proper credit where it is due.
How's that? You can shorten it if you want to.