APA (7th ed.) Citation

Geological Survey (U.S.) & Illinois. (1991). McLean County, Illinois: 1:100 000-scale metric topographic map. The Survey ; Illinois Geological Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and Illinois. McLean County, Illinois: 1:100 000-scale Metric Topographic Map. Reston, Va. : Champaign, Ill.: The Survey ; Illinois Geological Survey, 1991.

MLA (9th ed.) Citation

Geological Survey (U.S.) and Illinois. McLean County, Illinois: 1:100 000-scale Metric Topographic Map. The Survey ; Illinois Geological Survey, 1991.

Warning: These citations may not always be 100% accurate.