Title from HTML home page (viewed on June 5, 2008). Shows location for NOS hydrography surveys of North America. "Office of Coast Survey & National Geophysical Data Center." First appeared online May 2002. Includes overview map.
Technical Details
Mode of access: Internet from the NOAA NGDC web site. Address as of 6/5/08: http://map.ngdc.noaa.gov/website/mgg/nos%5Fhydro/viewer.htm; current access via PURL.
Action Note
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