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 Date: 2014-07-12 15:48:12Drift Guiding center Coal mining Till Geology Technology Physics Glaciology Drift mining Underground mining |
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| First Page | Document Content | |
|---|---|---|
Date: 2014-07-12 15:48:12Drift Guiding center Coal mining Till Geology Technology Physics Glaciology Drift mining Underground mining |
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PROCEEDINGS OF THE Birmingham Natural History and Philosophical Society Issued November, 1955.