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U.S. Geological Survey Coastal and Marine Geoscience Data System
USGS's compendium of geoscience data from the Coastal and Marine Geology Program (CMGP). Contains seismic, sidescan sonar, bathymetry, gravity, magnetic, and lidar data. Has a... -
Geoscience Australia
A division of the Australian Government. This page provides free downloadable geophysical data for Australia.