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Bluelink 2 books for verifiability. [goog]) #IABot (v2.0) (GreenC bot |
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* {{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 | isbn = 978-1-108-01600-1|ref=harv }}
* {{cite book|last=Seward|first=Albert Charles|title=Fossil plants: a text-book for students of botany and geology|url=https://archive.org/details/in.ernet.dli.2015.271130|year=1898|publisher=Cambridge University Press|pages=
* {{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|volume=200|pages=167–218|jstor=91931|bibcode=1909RSPTB.200..167S|ref=harv|doi=10.1098/rstb.1909.0005|issue=262–273 }}
* {{cite web |url=http://paleobiology.si.edu/paleoart/techniques/pages/reconstuct9.htm |title=NMNH Paleobiology: Illustration Techniques |work=paleobiology.si.edu |publisher=[[Smithsonian Institution]] |year=2007 |accessdate=9 August 2011 |archiveurl=https://web.archive.org/web/20110826114828/http://paleobiology.si.edu/paleoart/techniques/pages/reconstuct9.htm |archivedate=26 August 2011 |url-status=dead |ref={{Harvid|Smithsonian Institution|2007}} |df=dmy }}
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* {{cite journal | title = Mineralogy and origin of coal balls | journal = Geological Society of America North Central and South Central Section | year = 1995 | first = Henry L | last = Barwood | pages = 37|ref=harv }}
* {{cite journal|title=Formation of Coal Seams|series=Coal Age|volume= 21|pages=699–701|editor-last=Beard|editor-first=James T.|publisher=McGraw-Hill|year=1922 |ref=harv }} {{PD-notice}}
* {{cite book|title=The Wyoming Valley, upper waters of the Susquehanna, and the Lackawanna coal-region: including views of the natural scenery of northern Pennsylvania : from the Indian occupancy to the year 1875|url=https://archive.org/details/cu31924095270843|editor-last=Clark|editor-first=James Albert|year=1875|pages=[https://archive.org/details/cu31924095270843/page/n349 236]|id={{Google books|VQiU4W7x8X4C|The Wyoming Valley, upper waters of the Susquehanna, and the Lackawanna coal-region: including views of the natural scenery of northern Pennsylvania : from the Indian occupancy to the year 1875}}|ref=harv }} {{PD-notice}}
* {{cite book|title=The American Cyclopaedia: A Popular Dictionary of General Knowledge|editor-last=Ripley|editor-first=George|editor2-last=Dana|editor2-first=Charles A.|publisher=Appleton|year=1873|last=Conant|first=Blandina|volume=4|id={{Google books|aZhRAAAAYAAJ|The American Cyclopaedia: A Popular Dictionary of General Knowledge, Volume 4}}|ref=harv }} {{PD-notice}}
* {{cite journal|last=DiMichele|first=William A.|last2=Phillips|first2=Tom L.|year=1988|title=Paleoecology of the Middle Pennsylvanian-Age Herrin Coal Swamp (Illinois) Near a Contemporaneous River System, the Walshville Paleochannel|journal=Review of Palaeobotany and Palynology |volume=56|issue=1–2|pages=151–176|hdl=10088/7152|doi=10.1016/0034-6667(88)90080-2|ref=harv }}
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