APA (7th ed.) Citation

Topographic and Geologic Survey of Pennsylvania. (1906). Geological survey: 1899-1914.

Chicago Style (17th ed.) Citation

Topographic and Geologic Survey of Pennsylvania. Geological Survey: 1899-1914. Harrisburg, 1906.

MLA (9th ed.) Citation

Topographic and Geologic Survey of Pennsylvania. Geological Survey: 1899-1914. 1906.

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