APA (7th ed.) Citation

Pennsylvania. Bureau of Topographic and Geologic Survey. Pennsylvania geology. [Topographic and Geologic Survey, Dept. of Environmental Resources].

Chicago Style (17th ed.) Citation

Pennsylvania. Bureau of Topographic and Geologic Survey. Pennsylvania Geology. [Harrisburg]: [Topographic and Geologic Survey, Dept. of Environmental Resources].

MLA (9th ed.) Citation

Pennsylvania. Bureau of Topographic and Geologic Survey. Pennsylvania Geology. [Topographic and Geologic Survey, Dept. of Environmental Resources].

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