APA (7th ed.) Citation

Geological Survey. (1968). Chicago and vicinity, Illinois ([Printed] 1968.). Geological Survey.

Chicago Style (17th ed.) Citation

Geological Survey. Chicago and Vicinity, Illinois. [Printed] 1968. [Washington]: Geological Survey, 1968.

MLA (8th ed.) Citation

Geological Survey. Chicago and Vicinity, Illinois. [Printed] 1968. Geological Survey, 1968.

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