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Acknowledgments
Material presented in this book is based in large part on protocols that were
prepared by E&S Environmental Chemistry, Inc., under contract to the
US Forest Service, Air Resources Program, under the direction of A. Mebane.
Her assistance is greatly appreciated. Development of this material benefited
greatly from extensive review comments received on drafts of the Forest
Service protocols provided by Forest Service staff. Nevertheless, the Forest
Service has not been involved in preparation of this book, and no official
agency endorsement is implied. We are very grateful to Greg Lawrence
for technical assistance regarding all aspects of this book. We also thank
J.  Charles for technical assistance in the process of preparing this book.
The cover photo was taken by J.R. Webb.