APA (7th ed.) Citation

Clapp, F. G. (1905). Limestones of southwestern Pennsylvania. Department of the Interior, United States Geological Survey.

Chicago Style (17th ed.) Citation

Clapp, Frederick G. Limestones of Southwestern Pennsylvania. Washington, D.C.: Department of the Interior, United States Geological Survey, 1905.

MLA (9th ed.) Citation

Clapp, Frederick G. Limestones of Southwestern Pennsylvania. Department of the Interior, United States Geological Survey, 1905.

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