Report of Progress 1874-1889, A-Z. Geological Survey of Pennsylvania. Board of Commissioners for the Second Geological Survey,, Harrisburg,, 1875.
bibtex   
@book{geological_survey_of_pennsylvania._report_1875,
	address = {Harrisburg,},
	title = {Report of {Progress} 1874-1889, {A}-{Z}.},
	publisher = {Board of Commissioners for the Second Geological Survey,},
	author = {{Geological Survey of Pennsylvania.}},
	year = {1875}
}
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