Ann Heinrichs

A biography of the sixteenth-century cartographer Gerardus Mercator, who invented a method of projecting the curvature of the Earth's surface on to a flat sheet of paper.

Introduces distinguishing characteristics, life cycles, and different types of ants.

Describes the beginning of the Spanish mission system in California, its expansion, and the effects of the missions on the native peoples of that area.

This book provides information on Earth's sources of renewable and nonrenewable energy, how they are used, their benefits and disadvantages, their interrelationships with the natural world, and the future of Earth's sources of energy.

A biography of the wife of the sixth president of the United States, discussing her childhood, marriage, and social activities at the White House.