Geological Map of Berks County. Geological Survey of Pennsylvania., Lesley, J. P., Prime, undefined, D'Invilliers, E. V., & Sanders, R. H. 1884.
bibtex   
@misc{geological_survey_of_pennsylvania._geological_1884,
	address = {[Pennsylvania]},
	title = {Geological {Map} of {Berks} {County}},
	language = {English},
	publisher = {Second Geological Survey of Pennsylvania},
	author = {{Geological Survey of Pennsylvania.} and Lesley, J. P. and Prime, , Frederick and D'Invilliers, E. V. and Sanders, R. H.},
	year = {1884}
}

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