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* {{cite web|url=http://library.isgs.uiuc.edu/Pubs/pdfs/ges/es11.pdf|title=Fossil Peats from the Illinois Basin: A guide to the study of coal balls of Pennsylvanian age|last1=Phillips|first1=Tom|last2=Avcin|first2=Matthew J.|last3=Berggren|first3=Dwain|work=[[University of Illinois]]|year=1976|access-date=16 July 2011|archive-url=https://web.archive.org/web/20111009122255/http://library.isgs.uiuc.edu/Pubs/pdfs/ges/es11.pdf|archive-date=9 October 2011|url-status=dead}}
* {{cite web |url=http://www.life.illinois.edu/plantbio/People/Faculty/Phillips.htm |title=T L 'Tommy' Phillips, Department of Plant Biology, University of Illinois |last=Phillips |first=Tom L. |publisher=University of Illinois |access-date=31 July 2011 |archive-url=https://web.archive.org/web/20110727023325/http://www.life.illinois.edu/plantbio/People/Faculty/Phillips.htm |archive-date=27 July 2011 |url-status=dead }}
* {{cite journal | url = http://library.isgs.uiuc.edu/Pubs/pdfs/circulars/c480.pdf | title = Development of Paleobotany in the Illinois Basin | access-date = 15 September 2011 | last1 = Phillips | first1 = Tom L. | last2 = Pfefferkorn | first2 = Herman L. | last3 = Peppers | first3 = Russel A. | year = 1973 | publisher = Illinois State Geological Survey | url-status = dead | archive-url = https://www.webcitation.org/65MsdHHUJ?url=http://library.isgs.uiuc.edu/Pubs/pdfs/circulars/c480.pdf | archive-date = 11 February 2012 | df = dmy-all | doi = 10.5962/bhl.title.61485 | hdl = 2142/43012 | hdl-access = free }}
* {{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 | first1 = Tom L. | last1 = Phillips | last2=Peppers|first2= Russel A. | volume = 3 | issue = 3 | pages = 205–255| 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]]|last1=Scott|first1=Andrew C.|last2=Rex|first2=G.M.|year=1985|access-date=15 July 2011|volume=B 311|pages=123–137|jstor=2396976|issue=1148|doi=10.1098/rstb.1985.0144 |bibcode = 1985RSPTB.311..123S }}
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