APA (7th ed.) Citation

Geological Survey (U.S.). (1956). State of Pennsylvania. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). State of Pennsylvania. Washington, D.C.: The Survey, 1956.

MLA (9th ed.) Citation

Geological Survey (U.S.). State of Pennsylvania. The Survey, 1956.

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