http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Map showing potential sources of gravel and crushed-rock aggregate in the Boulder-Fort Collins-Greeley area, Front Range urban corridor, Colorado
Boulder-Fort Collins-Greeley area, Front Range urban corridor, Colorado
Miscellaneous investigations series (Geological Survey (U.S.)) ; map I-855-D