This series is the definitive collection of informational books for intermediate-grade readers. With 20 to 30 new titles every year, Watts Library "TM" spans all subjects in the science and social studies curricula -- including animals, space, American Indians, U.S. history, geography, cutting-edge sports, and more!Throughout the turbulent and often difficult history of the regions in Africa, strong leaders have appeared as rulers of these proud nations. Each book in this series looks at the lives and legacies of some of these memorable kings and queens.