http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
impacted without binder from partially volatilized Illinois coals; progress report of a laboratory investigation. II. Smoke index: a qualitative measurement of smoke
At head of title: State of Illinois ... Department of registration and education.
Report of investigations (Illinois State Geological Survey) ; no. 41