This is the 1981 edition of the D&D Expert Rulebook by Dave Cook, which was sold as a counterpart to the Moldvay D&D Basic Set.
The Dungeons & Dragons Expert Rules (1981), by David "Zeb" Cook, was released simultaneously with the second edition Basic Rules (1981) in January 1981. For the first time ever, it offered the opportunity to achieve levels 4-14... [click here for more]
This is the 1983 edition of the D&D Expert Rulebook, part of the "BECMI edition."
This product does not include X1: "The Isle of Dread".
The D&D Expert Rules Set (1983), by Frank Mentzer, is the second iteration of the boxed Expert Rules for Basic D&D and the second volume in Mentzer's BECMI rules series. It was published... [click here for more]