Contents

COVER

INTRODUCTION

WHAT IS A TREE?

FOREST TYPES AND LIFE ZONES
     Western Forest Types
     Forests Of Hawaii National Park
     Eastern Forest Types
     Unusual Forests

FOREST ENEMIES

PRESERVATION OF NATURAL CONDITIONS

Illustrations

Except as shown below, the illustrations in this publication are from National Park Service photographs.

Aspen and pine, North Rim, Grand Canyon—Union Pacific photo. Isle Royale—National Park Concessions, Inc., photo by W. Ray Scott. Great Smoky Mountains stream—Thompson Bros., copyright photo. Great Smoky Mountains hemlock and tulip poplar—Thompson Bros., copyright photos.

UNITED STATES DEPARTMENT OF THE INTERIOR
Douglas McKay, Secretary

NATIONAL PARK SERVICE
Conrald L. Wirth, Director