http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
oil and gas resources of the Ava-Campbell Hill area
Ava-Campbell Hill area, Oil and gas resources of the
At head of title: State of Illinois. Department of Registration and Education. Division of the State Geological Survey.
Report of investigations (Illinois State Geological Survey) ; no. 16