APA (7th ed.) Citation

Commonwealth of Pennsylvania Dept. of Internal Affairs Topographic and Geologic Survey. Service and list of publications.

Chicago Style (17th ed.) Citation

Commonwealth of Pennsylvania Dept. of Internal Affairs Topographic and Geologic Survey. Service and List of Publications. Harrisburg, Pa.

MLA (9th ed.) Citation

Commonwealth of Pennsylvania Dept. of Internal Affairs Topographic and Geologic Survey. Service and List of Publications.

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