The Mineral Industry of Pennsylvania in 1974 William Kebblish Published: 1978 Total Pages: 52 Get eBook
Monthly Catalog of United States Government Publications, Cumulative Index United States. Superintendent of Documents Published: 1976 Total Pages: 1466 Get eBook
Annotated Bibliography of Pennsylvania Geology Sandra Blust Published: 1986 Total Pages: 568 Get eBook
Bureau of Mines, Pittsburgh Mining and Safety Research Center Research and Development Activities: Fiscal Year 1971 Pittsburgh Mining and Safety Research Center Published: 1974 Total Pages: 676 Get eBook
