APA (7th ed.) Citation

Iowa Geological Survey. (1969). Bedrock of Iowa. The Survey.

Chicago Style (17th ed.) Citation

Iowa Geological Survey. Bedrock of Iowa. Iowa City: The Survey, 1969.

MLA (8th ed.) Citation

Iowa Geological Survey. Bedrock of Iowa. The Survey, 1969.

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