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- Federal Highway Administration (FHWA)1
- The research upon which this publication is based was supported by funds provided by the United States Department of Interior, Office of Water Resources Research, as authorized under the Water Resources Research Act of 1964.1
- The research upon which this report is based was financed in part by the U.S. Department of the Interior, Washington, D.C., under the Mt. St. Helens Research and Development Program.1
- This research has been supported in part by the National Science Foundation under Contract No. CCR-89-02496.1
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