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" Horizontal galleries may be driven everywhere at very slight expense, and so worked as to drain themselves, while the cars, laden with coal and attached to each other, glide down on a railway, so as to deliver their burden into barges moored to the river's... "
Travels in North America: With Geological Observations on the United States ... - Pagina 26
door Sir Charles Lyell - 1845
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THE SUBTERRANEAN WORLD

DR. GEORGE HARTWIG - 1871
...coal, ten feet thick, breaks out in the steep cliff at the water's edge. Horizontal galleries maybe driven everywhere at very slight expense, and so worked...with coal, and attached to each other, glide down on a railway so as to deliver their burden into barges moored to the river's bank. The same seam may...
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Rocks Ahead, Or, The Warnings of Cassandra

William Rathbone Greg - 1874 - 233 pagina’s
...feet thick, commonly called the Pittsburg seam, breaking out in the steep cliff at the water's edge. Horizontal galleries may be driven everywhere at very...with, coal and attached to each other, glide down on a railway, so as to deliver their burdens into barges moored to the river's bank. The same seam...
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The Natural Resources of the United States

Jacob Harris Patton - 1891 - 120 pagina’s
...magnitude of this seam of coal, says, " Horizontal galleries may be driven everywhere at very little expense, and so worked as to drain themselves, while...with coal, and attached to each other, glide down on a railway, so as to deliver their burden into barges moored to the river's bank." He might have...
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