The Warhammer 40,000 Rulebook 1993 Edition, by Games Workshop, is a core rules book for the Warhammer game in English. It specifically focuses on the Space Marines army, providing players with essential information and guidelines to enhance their gaming experience. This rulebook is a valuable resource for fans of Warhammer and wargames, offering a comprehensive guide to the game mechanics and strategies for Space Marines in the Warhammer 40,000 universe.