From publisher blurb:
Inspired by the AD&D Dungeon Masters Guide.
Gary wrote and collected a vast amount of information, rules, and guidance. Its haphazard nature and perplexing subjects makes it as fresh today as when he penned the work almost fifty years ago. Indeed, Gary's Appendixdraws inspiration from the past works of the gaming giants.
Gary's Appendix is about our love for the past and our excitement for the future. We do not have the audacity to believe that we can produce a work that matches the magic of the AD&D DMG. Instead, we seek the spirt of that evergreen work by presenting an array of articles that are enjoyable to read, informative to the GM, and useful at the gaming table.
Each issue contains a collection of articles written for the OSR by a variety of authors. In addition, Jeff contributes an expanded entry for a collection of monsters from the OSE collection.