Are you just getting into the vintage 12 inch GI JOE collecting hobby? Are you wondering which accessories go to which set? If so, then we would recommend "The New Official Identification Guide To GI JOE 1964-1978," by James DeSimone. In our opinion, this is the best reference guide in the hobby. The featured picture is of our personal copy of the book. As you can see, it's quite worn. It still gets a lot of use from us! The book does a great job at highlighting each specific Hasbro GI JOE set, the specific accessories in those sets, and what year the set was introduced. It's mainly pictures, which in our opinion, is the best way to identify anything GI JOE. You can find an inexpensive copy of the book online by doing a simple name search. Well spent money if you're a vintage Joe collector.
~Ryan's Vintage GI JOE & Toy Bricks