National Geophysical Data Center

National Geophysical Data Center (USA); National Geospatial Data Clearinghouse
NGDF
National Geospatial Data Files; National Geospatial Data Framework (UK) ...

National Geophysical Data Center, 1988, Topography data base - data announcement 88-SE-1102: National Geophysical Data Center, Boulder, Colo. Seaber, Paul R., F. Paul Kapinos, and George L.