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<br />~ m0U'N pR F„ 0,. ~~ ~ ~^PItOULCTION ( iK1ND Or^ COAk Bituminous •
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<br />TONS YEAR TONS +
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<br />sI.EVAT ON AT MIk1Ps FLF4D .,.,,,.____
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<br /> ' 1891 ! 191G~ t ,_
<br />DRIFT ILENGTH
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<br />1 191? I ,~,~.
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<br />"1395: x'1920 I I
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<br />1896 i
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<br />r~r-„?, -~ ' 1897: ~ 1922 RA7~LROAD AT SSLHL i ..
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<br />1900 ; 192
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<br />~^ ''+928 1
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<br />~' 19[14 ~,,,,,
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<br />~:, ].905 .1930 I tl ~ (
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