International journal of coal geology
51
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Amsterdam : Elsevier Scientific,
1980
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| Online Access: | http://www.sciencedirect.com/science?_ob=JournalURL&_cdi=5867&_auth=y&_acct=C000013278&_version=1&_urlVersion=0&_userid=167669&md5=a92c9a856fb914e6f5a75bafc0d18a15 |