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* {{cite journal | title = Changing patterns of Pennsylvanian coal-swamp vegetation and implications of climatic control on coal occurrence | journal = International Journal of Coal Geology | date = February 1984 | first = Tom L. | last = Phillips | last2=Peppers|first2= Russel A. | volume = 3 | issue = 3 | pages = 205–255|ref=harv | doi = 10.1016/0166-5162(84)90019-3 }}
* {{cite journal|url=http://digirep.rhul.ac.uk/file/c58e6257-7af3-2f87-0eeb-c9c521ae0dbb/1/38ScottandRex.pdf|title=The formation and significance of Carboniferous coal balls|journal=[[Philosophical Transactions of the Royal Society]]|last=Scott|first=Andrew C.|last2=Rex|first2=G.M.|year=1985|accessdate=15 July 2011|volume=B 311|pages=123–137|jstor=2396976|ref=harv|issue=1148|doi=10.1098/rstb.1985.0144 |bibcode = 1985RSPTB.311..123S }}
* {{cite book | last1 = Seward | first1 = A. C. | title = Plant Life Through the Ages: A Geological and Botanical Retrospect | publisher = Cambridge University Press | year = 2010
* {{cite book|last=Seward|first=Albert Charles|title=Fossil plants: a text-book for students of botany and geology|year=1898|publisher=Cambridge University Press|pages=84–87|ref=harv }} {{PD-notice}}
* {{cite journal|last=Stopes|first=Marie C.|authorlink=Marie Stopes|last2=Watson|first2=David M. S.|authorlink2=D. M. S. Watson|year=1909|title=On the Present Distribution and Origin of the Calcareous Concretions in Coal Seams, Known as 'Coal Balls'|journal=Philosophical Transactions of the Royal Society|publisher=Royal Society|location=Britain|volume=200|pages=167–218|jstor=91931|bibcode=1909RSPTB.200..167S|ref=harv|doi=10.1098/rstb.1909.0005|issue=262–273 }}
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