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Support for this project was provided by the U.S. Department of the Interior and U.S. Geological Survey under Cooperative Agreement No. 04HQAG0132. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. government.

International Standard Book Number-13: 978-0-309-10357-2

International Standard Book Number-10: 0-309-10357-6

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