http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
including mineral wealth of the Black Hills, by Cleophas C. O'Harra, and mineral building materials, fuels and waters of South Dakota with production for 1900, by James E. Todd.
O'Harra's paper was published also as Bulletin number 6 of South Dakota School of Mines, with title: Mineral wealth of the Black Hills.
Bulletin (South Dakota Geological Survey) ; 3