http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
produced by the United States Geological Survey.
Relief shown by contours and spot heights.
"Produced from original manuscript drawings."
"Compiled from aerial photographs taken 1982, field checked 1985, map edited 1991."
Includes quadrangle location map and index to adjoining quadrangles.