APA (7th ed.) Citation

Iowa Geological Survey. (1969). Geologic map of Iowa. [publisher not identified].

Chicago Style (17th ed.) Citation

Iowa Geological Survey. Geologic Map of Iowa. [Des Moines?]: [publisher not identified], 1969.

MLA (9th ed.) Citation

Iowa Geological Survey. Geologic Map of Iowa. [publisher not identified], 1969.

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