Our endangered planet.

By Mary King Hoff

Describes the global uses and abuses of groundwater and suggests ways to preserve this valuable resource.

Our endangered planet.

By Mary King Hoff

Alerts the reader to the dangers of surface water pollution and the global imperative to keep these waters fresh.

Our endangered planet.

By Cornelia Fleischer Mutel

Studies the ecology of tropical rain forests, or jungles, and the vital role of their water, air, plant, and animal resources in preserving the global environmental balance. Also describes how easi...

Our endangered planet.

By Mary King Hoff

Describes concisely the global uses and abuses of the world's oceans and seas.

Our endangered planet.

By Suzanne Winckler

An introduction to the world's coldest continent, its geography, its wildlife, and its role in the global environment.

Our endangered planet.

By Mary King Hoff

Describes the delicate ecological balance among all living things on land, the damage done by humanity in contributing to the extinction of various species, and ways of preventing further harm.

Our Endangered Planet

By Mary M. Rodgers, Suzanne Winckler

Discusses the formation and the role of different types of soils and how they have been endangered through unwise farming, mining, and grazing.

Our endangered planet.

By Lisa Yount

Bolivia in pictures

By

An introduction to the geography, history, government, people, and economy of the landlocked country of Bolivia.

Colombia in pictures

By

An introduction to the geography, history, people, government, and economy of the fourth largest country in South America.