http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Mark Twain National Forest (Salem-Potosi Ranger Districts), Missouri, 1981
Reformated and updated in 1981 by USFS Geometronics Service Center.
base material prepared in the Regional Office, USDA Forest Service.
"Minor revisions added from Forest Service maps, aerial photographs, and 1963 field examination."
Includes key map and "Index to Geological Survey topographic maps."