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"Coal seams" » "Coal seems"
3
Published in 2004
doi: 10.1016/S1342-937X(05)70313-0
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conference paper or compendium article online
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13
Published in 1992
doi: 10.1306/BF9AB711-0EB6-11D7-8643000102C1865D
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journal article online
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18