Forgotten Realms
The "Campaign Set" (often referred to as the "Grey Box") was later released in 1987 as a boxed set of two source books ("Cyclopedia of the Realms" and "DM's Sourcebook of the Realms") and four large maps, designed by Greenwood in collaboration with author Jeff Grubb. The set introduced the campaign setting and explained how to use it, and reserved space on the map for SSI's Gold Box computer role-playing games set in the Forgotten Realms.
The Forgotten Realms Atlas
The Forgotten Realms Atlas was a book produced by Karen Wynn Fonstad and provided detailed maps of the Forgotten Realms, a fictional setting in the "Dungeons & Dragons" fantasy role-playing game.