The discovery of oil springs and wells in various ... the efficient cause of the metamorphism of bituminous into anthracite coal. I wiU now proceed to state, in reference to the tlieory of your ...
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F. Isherwood, Chief Engineer, U. S. N., it appears that the Collin's steamers use anthracite on the voyage to Liverpool, and Welsh coal, also an anthracite, on the return voyage. The Welsh coal ...
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