Van Lieu, J., & Patterson, E. D. 1. (1964). Coal resources of Lawrence County, Pennsylvania. Washington: U.S. Government Printing Office.
Citación estilo ChicagoVan Lieu, J.A., y Elmer Davisson 1916- Patterson. Coal Resources of Lawrence County, Pennsylvania. Washington: U.S. Government Printing Office, 1964.
Cita MLAVan Lieu, J.A., y Elmer Davisson 1916- Patterson. Coal Resources of Lawrence County, Pennsylvania. Washington: U.S. Government Printing Office, 1964.
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