xxiv INTRODUCTION 



which there are eleven, all situated within one or 

 more of the National Forests. These were created 

 under an act of Congress for the preservation of 

 objects of historic or scientific interest. The lar- 

 gest monxoment, and no doubt the most famous, is 

 the Grand Canyon National Monument located in 

 the Tusayan and Kaibab National Forests in Ari- 

 zona, comprising over 800,000 acres. The next 

 largest is the Mount Olympus Monument on the 

 Olympic National Forest in Washington, compris- 

 ing almost 300,000 acres. Other well-known mon- 

 imients are the Cinder Cone and the Lassen Peak 

 Monuments on the Lassen National Forest in Cali- 

 fornia, and the Cliff Dwellings on the Gila National 

 Forest in New Mexico. 



The Size and Extent of the National Forests, 

 With this brief introduction of the nature of the 

 country in which the National Forests are located, 

 the reader will be interested to know something of 

 the size of the Forests and their total area. The 

 total area varies slightly from time to time, due to 

 the addition of lands that have been found to have 

 value for forestry purposes, or to the elimination of 

 lands found to be chiefly valuable for agricultural 

 use. On June 30, 1917, there were 147 National 



