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Preliminary Floatation Tests on the Beneficiation of a Low-Grade Montana Bituminous Coal.

机译：低品位蒙大拿州烟煤选矿的初步浮选试验。

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Coal is an aggregation of vegetal matter with varying small amounts of mineral and animal matter which have been so changed by the processes of sedimentation, decay and metamorphism that it has become a dense, dark, combustible substance. It occurs in beds varying in thickness from one foot or less to over 300 feet. The horizontal extent of a bed is sometimes continuous over an area as large as the State of Montana.

机译：煤是一种植物性物质的聚集体，具有少量的矿物质和动物性物质，这些物质通过沉积，衰变和变质作用而发生了巨大变化，以至于它已成为一种致密，黑暗，可燃的物质。它发生在厚度从1英尺或更小到300英尺以上的床中。床的水平范围有时在像蒙大拿州一样大的区域上是连续的。

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Given William Packwood;
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年度 1934
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Preliminary Floatation Tests on the Beneficiation of a Low-Grade Montana Bituminous Coal.

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