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.
Player's Guide to the Forgotten Realms Campaign
"Player's Guide to the Forgotten Realms Campaign" is an "Advanced Dungeons & Dragons" game supplement published as a 132-page softcover book by TSR, Inc. Design is by Anthony Herring with additional material by Jeff Grubb, Karen Boomgarden, Julia Martin, Steven Schend, J. Robert King, and Tim Beach, and editing by Jonatha Ariadne Caspian. Illustrations are by Valerie Valusek with a cover by Larry Elmore.