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Monday, May 4, 2020 | History

3 edition of Rock Dust in Bituminous-Coal Mines During 1930-33. found in the catalog.

Rock Dust in Bituminous-Coal Mines During 1930-33.

United States. Bureau of Mines.

Rock Dust in Bituminous-Coal Mines During 1930-33.

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Published by s.n in S.l .
Written in English


Edition Notes

1

SeriesReport of investigations (United States. Bureau of Mines) -- 3295
ContributionsAdams, W.W., Geyer, L.E., Parry, M.G.
ID Numbers
Open LibraryOL21750057M


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Rock Dust in Bituminous-Coal Mines During 1930-33. by United States. Bureau of Mines. Download PDF EPUB FB2

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Real coal prices rose from toand bituminous coal prices fell sharply from then to (Figure 12) Coal mining employment plummeted during the twenties.

Annual earnings, especially in bituminous coal mining, also fell because of dwindling hourly earnings and, from on, a shrinking workweek.

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