From the cover:
Palace of the Vampire Queen is an adventure designed for four to six characters of 3rd to 5th level. This dungeon kit includes the original adventure as presented more than 30 years ago as well as a new version designed for use with the First Edition Advanced Game rules.
This edition of the scenario is a reprint of the original for the North Texas RPG Con. It contains the full text of the original scenario in addition to a new set of keys by Bill Barsh.
"I just wanted to jump in and say that it was my distinct pleasure to be a part of this piece of history. Palace of the Vampire Queen is the first module produced for Dungeons & Dragons and that in itself makes it a genuine piece of D&D history. My goal in designing the updated keyed areas was to maintain the original feel, but create a more “playable” version of the module. This particular printing was limited to 200 copies (almost all of which were sold at the 2012 North Texas RPG Convention). Stay tuned because there is more to come!"