Coal ball: Difference between revisions

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* {{cite journal|title=The Mode of Origin of Coal|last=Jeffrey|first=Edward C.|journal=The Journal of Geology|year=1915 |volume=23|pages=218–230|id={{Google books|kX3zAAAAMAAJ|The Journal of Geology, volume 23}}|ref=harv|doi=10.1086/622227|issue=3|bibcode=1915JG.....23..218J }} {{PD-notice}}
* {{cite book|title=Taphonomy: a process approach|year=1999|last1=Martin|first1=Robert E.|publisher=[[Cambridge University Press]]|edition=Illustrated|isbn=978-0-521-59833-0|ref=harv }}
* {{cite web|url=http://www.ucmp.berkeley.edu/paleo/fossils/permin.html |title=Fossils – Window To The Past (Permineralisation) |accessdate=8 July 2011 |archiveurl=http://www.webcitation.org/60Wv0sx12?url=http://www.ucmp.berkeley.edu/paleo/fossils/permin.html |archivedate=2829 July 2011 |deadurl=no |ref=harv |df=dmy }}
 
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