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    (From the Sandwich Island News, August 5, 1848) A friend has furnished us with the following extract from a letter dated San Francisco, May 27,1848:

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  • » gold mining history

    (From the Sandwich Island News, August 5, 1848) A friend has furnished us with the following extract from a letter dated San Francisco, May 27,1848:

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    Abutment In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch ...

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