143 



iteit(!Hfi»ledifn 



!!!*•" 



The authors would like to thank the many people who provided information, guid- 

 ance, and other assistance during the process of writing this paper. Their help was 

 crucial in allowing us to obtain a broad picture. We would particularly like to than 

 Matthew A. Fogelson, who started this project by devoting his summer to research- 

 ing exotic pests of North American trees in 1991. 



NRDC is a non-profii cn^nronmcniaj mcmlxTship organization with more than 170.000 

 members and conlnbutors nationwide. Since 1970. NRDC sciennsts and lawyers have 

 been working to protect the world's natural resources and to improve the quality of the 

 human environment. NRDC has offices m New York Qty. Washington, DC, San 

 Francisco, Los Angeles, and Honolulu. 



Copyright 1994 by the Natural Resources Defense Council, Inc. 

 Design: Nancy Butkus 



Maps(throughout text): American Forests. Knowing Your 7ms, 1 1th printing, 1949 



Cover an. Renee Chagnon 



Desktop Publishing: Bonnie Green6eld 



For additional copies of this report, send $7.50 plus $1.45 shipping and handlmg per 

 copy to: NRDC Publications. 40 West 20th Street, New York. NY 1001 1 . Please make 

 checks payable to NRDC in U.S. dollars only. Cahfomu residents please add 55« sales 

 tax. 



