The Ultimate Unofficial Collector's Guide to D&D: Volume Two: Mystara and Greyhawk

This collector's list is incredibly complete. It includes not only the books published by TSR and Wizards of the Coast, but those before TSR and those officially licensed by WotC. It also includes licensed miniatures, magazines, and other RPG-related products. This second volume includes the products for Mystara (including subsettings Hollow World and Red Steel), and Greyhawk.