http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Arco : 1:100,000-scale topographic map : 30 x 60 minute series (topographic)
edited and published by the Bureau of Land Management, National Applied Resource Sciences Center ... in cooperation with BLM Idaho State Office.
Relief shown by contours and spot heights.
Includes location map, 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 ;