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Investigation of the Benjamin Franklin graphite mine (government owned) and the Just graphite mine, Chester County, Pa.

Published Year

• 1940-1949 (1)

Subject

• Graphite industry--Pennsylvania--Chester County (1)
• Graphite--Pennsylvania--Chester County (1) *

Author

• Lamb, F. D. (1)
• Sanford, Robert S. (1) *

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