Fettke, C. R. (Charles Reinhard). (19181919). Glass manufacture and the glass sand industry of Pennsylvania. Harrisburg: Penna., J. L. L. Kuhn, printer.MLA Citation
Fettke, Charles R. (Charles Reinhard), 1888-1959. Glass Manufacture And the Glass Sand Industry of Pennsylvania. Harrisburg: Penna., J. L. L. Kuhn, printer, 19181919.
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