APA (7th ed.) Citation

(1969). Geologic map of Iowa. Williams & Heintz.

Chicago Style (17th ed.) Citation

Geologic Map of Iowa. Washington, D. C: Williams & Heintz, 1969.

MLA (9th ed.) Citation

Geologic Map of Iowa. Williams & Heintz, 1969.

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