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101 0 $aeng
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200 1 $aEighth Annual International Pittsburgh Coal Conference$eproceedings$eOctober 14-18, 1991
210   $aPittsburgh$cUniversity of Pittsburgh$d1991
215   $aXXXI, 1207 p.$cill.$d22 cm
710 12$aInternational Pittsburgh Coal Conference,$d8.$f<1991 ;$ePittsburgh>
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