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McGraw-Hill
> William J Douglas
William J Douglas
title
ISBN-13
(ISBN-10)
year of publication
Production systems analysis in underground coal mines
978-O-O7-6O6657-5
(O-O7-6O6657-6)
1980
J.D.
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J. Douglas
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W Douglas
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W.J.
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William D.
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William Douglas
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William J.
William J. Dowlding