http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Mineral resource database for deposits related to the Mesoproterozoic Midcontinent Rift System, United States and Canada
1 online resource (v, 20 pages) : color map.
by Laurel G. Woodruff, Klaus J. Schulz, Connie L. Dicken, and Suzanne W. Nicholson.
U.S. Geological Survey open-file report ; 2020-1069