TSR made extensive use of mock-up cover image art for catalogs and advertising. In the 1992 Spring/Summer Catalog, TSR used a mock-up image for Gamma World, 4th edition. EDIT Nov 2019 Had a GW4 rulebook come through the shop, snapped some photos of that wonderful detachable poster map that is found inside the back cover. … Continue reading Gamma World (1992): TSR preproduction cover (plus some pics of the final poster map)