http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Omaha pool and mica-periodotite intrusives, Gallatin County, Illinois
"Reprinted from Structure of typical American oil fields, volume III, Amer. Assoc. Petrol. Geol. (April, 1948), pp. 189-212."
Report of investigations (Illinois State Geological Survey) ; no. 130
Illinois. Univ. Library for Library of Congress