One hundredth anniversary of the founding of Pennsylvania's first Geological Survey.
APA Citation
Geological Survey of Pennsylvania. (1936). One hundredth anniversary of the founding of Pennsylvania's first Geological Survey. [Harrisburg]: Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Typographic and Geologic Survey.
MLA Citation
Geological Survey of Pennsylvania. One Hundredth Anniversary of the Founding of Pennsylvania's First Geological Survey. [Harrisburg]: Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Typographic and Geologic Survey, 1936.
Warning: These citations may not always be complete (especially for serials).