http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Springer : 1:100,000-scale topographic map : 30 x 60 minute series (topographic)
edited and published by the Bureau of Land Management National Operations Center in cooperation with the Bureau of Land Management New Mexico State Office.
Relief shown by contours and spot heights.
Includes location map and indexes to adjoining maps and to 1:24,000-scale maps.
Scale 1:100,000. 1 cm. on the map represents 1 km. on the ground ;