APA (7th ed.) Citation

Maryland Geological Survey & Clark, W. B. (1901). Eocene. The Johns Hopkins press.

Chicago Style (17th ed.) Citation

Maryland Geological Survey and William Bullock Clark. Eocene. Baltimore: The Johns Hopkins press, 1901.

MLA (8th ed.) Citation

Maryland Geological Survey and William Bullock Clark. Eocene. The Johns Hopkins press, 1901.

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