http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1:100 000-scale metric topographic map : 30 x 60 minute series (topographic)
produced by the United States Geological Survey in cooperation with the Nevada Bureau of Mines and Geology.
Relief shown by contours and spot heights.
Includes location map and index to adjoining maps.
Scale 1:100,000. 1 cm. on the map represents 1 km. on the ground ;