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NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance.

This study was supported by the National Oceanic and Atmospheric Administration, Department of Commerce, under Contract No. 56-DGNA-1-90024 TO#7; by the U.S. Geological Survey, Department of the Interior, under Cooperative Agreement No. O1HQAGO217; and by the U.S. Environmental Protection Agency under Grant No. X-82951601. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the agencies that provided support for the project.

Cover: Images courtesy Center for Coastal and Ocean Mapping, University of New Hampshire. Background image is USGS multibeam data from San Francisco Bay combined with USGS topographic data; inset image is three-dimensional model of seamless offshore-onshore dataset produced by Tampa Bay Bathy/Topo/Shoreline Demonstration Project, with high sea level superimposed. Cover designed by Michael D. Dudzik.

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