After conducting a thorough search, I found that "White Dwarf 133" is a legendary publication by Games Workshop, a British gaming company. White Dwarf was a monthly magazine that served as the primary source of information for the Warhammer Fantasy Battle and Warhammer 40,000 universes.
Expansions for the beloved corridor-combat game, offering new missions that pushed the tactical limits of Terminators versus Genestealers. white dwarf 133 pdf