APA (7th ed.) Citation

Não informado. (1969). Pennsylvania Geology. Bureau of Topographic and Geologic Survey.

Chicago Style (17th ed.) Citation

Não informado. Pennsylvania Geology. Harrisburg, Pa: Bureau of Topographic and Geologic Survey, 1969.

MLA (8th ed.) Citation

Não informado. Pennsylvania Geology. Bureau of Topographic and Geologic Survey, 1969.

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