Map of the oil regions of western Pennsylvania and South Western New York : showing the outlines of all producing areas discovered prior to July, 1884.
MLA
Map of the Oil Regions of Western Pennsylvania and South Western New York : Showing the Outlines of All Producing Areas Discovered Prior to July, 1884. Second Geological Survey of Pennsylvania , 1884. https://collections.library.yale.edu/catalog/15811145.
APA, 6th edition
Map of the oil regions of western Pennsylvania and South Western New York : showing the outlines of all producing areas discovered prior to July, 1884. (1884). [Maps]. Second Geological Survey of Pennsylvania , https://collections.library.yale.edu/catalog/15811145.
