This publication contains summary information on the digital marine geophysical data holdings of the National Geophysical and Solar-Terrestrial Data Center. The general description of the bathymetric, magnetic, and gravimetric data includes discussion on exchange formats, data sources, assimilation procedures, and geographic distribution. Data summaries are presented as trackline plots, a geographical listing (by 10-degree squares), and an institutional listing. Complementary data files, such as U.S. coastal bathymetry, analog marine geophysical data (i.e., - seismics), site survey data of the outer continental shelf, and marine geological data, are reviewed briefly.

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