U.S. National Ocean Service hydrographic surveys index : operators manual.
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The National Ocean Service (NOS) maintains an index of the approximately 10,000 hydrographic surveys it has performed since 1834. The index takes the form of a large number of charts on which survey boundarys are hand-drawn. These charts are manually searched to identify surveys in an area of interest. The HSINDEX computer program is designed to assist in searching a digital version of the hydrographic surveys index. 1988 NOS (National Ocean Service) Library Public Domain 1935
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2021-10-06
