Duke Nukem 3D Toolkit CDROM, OCT 1996.  Walnut Creek CDROM.
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 FAQs, loads of good info!
 path: \faqs
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dukefix.txt  Workarounds for known problems.
editart.txt  Answers for some EDITART questions. EditArt is an Apogee program provided on the Duke3D CDROM.
editing.txt  v1.2 of Klaus Breuer's UnOfficial Duke Nukem 3D Editing FAQ. This is an excellent reference and a 'must-read' if you plan to make your own levels.
mapfaq03.zip Brett Gmoser's excellent map editing FAQ. Contains many examples and a thorough explanation of the level creation process for Duke 3D.
museum.map   This file accompanies Klaus's Editing FAQ.
museum.prn   This file accompanies Klaus's Editing FAQ.
rtsfaq.txt   Charlie Wiederhold's Official RTS (Remote Ridicule Sound) FAQ ver 1.0.
secrets.txt  Wilson Cheung's Duke Nukem 3D Secret Places List.
whatsrts.txt RTS files -What are they