UFO'S

by Susan Harris

Published 31 December 1980

Space

by Susan Harris

Published 31 December 1979
Introduces the solar system, rockets, satellites, space travel, UFO's, and other elements of outer space.

The World beneath the Sea

by Susan Harris

Published 31 December 1979
Briefly examines the ocean's currents, floor, vegetation, and animal life. Includes a discussion of underwater exploration.

Crocodiles and Alligators

by Susan Harris

Published 31 December 1980
Facts about the physical characteristics and behavior of the members of the crocodilian family.

Volcanoes

by Susan Harris

Published 31 December 1979
Explains in simple terms different types of volcanic eruptions, the formation of volcanoes, and the theory of plate tectonics.