http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
prepared by the U.S. Geological Survey for publication by the Defense Mapping Agency Hydrographic/Topographic Center.
Relief shown by contours and spot heights.
"Compiled in 1991 from best available sources."
Includes boundaries, adjoining sheets, slope, and elevation guides.