Trees are a valuable natural resource. People depend on trees for food, and animals depend on trees for food and shelter. But most important, we depend on trees because they add oxygen, a gas we all need, to the air. While trees give us many wonderful products, we must also protect them because we can't live without them.

Be a Friend to Trees 1994, HarperCollins, New York, NY

ISBN-13: 9780064451208

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Be a Friend to Trees 1994, Turtleback Books, New York, NY

ISBN-13: 9780785733393

Turtleback School & Library edition

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Be a Friend to Trees 1994, HarperCollins Publishers, New York, NY

ISBN-13: 9780060215293

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Be a Friend to Trees 1994, HarperCollins Publishers

ISBN-13: 9780060215286

Hardcover

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