APA (7th ed.) Citation

Geological Survey (U.S.) & Illinois. (1987). Gallatin County, Illinois, 1986: 1:100 000-scale planimetric map. The Survey ; Illinois Geological Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and Illinois. Gallatin County, Illinois, 1986: 1:100 000-scale Planimetric Map. Reston, Va. : Champaign, Ill.: The Survey ; Illinois Geological Survey, 1987.

MLA (9th ed.) Citation

Geological Survey (U.S.) and Illinois. Gallatin County, Illinois, 1986: 1:100 000-scale Planimetric Map. The Survey ; Illinois Geological Survey, 1987.