Inner Sphere Sourcebook

From the back cover: The Inner Sphere sourcebook provides information on the five great houses - Kurita, Davion, Liao, Marik, Steiner - as well as the lesser powers of the periphery. The Inner Sphere also offers general histories of each society, comprehensive maps and a section detailing ten key worlds of the Inner Sphere. "For use with Battletech and Mechawarrior"