@book {7865,
	title = {Pal{\ae}ontology},
	series = {Geological Survey of Illinois},
	volume = {2},
	year = {1866},
	note = {Have 339-341, pl.37},
	publisher = {Authority of the Legislature of Illinois},
	organization = {Authority of the Legislature of Illinois},
	address = {Chicago},
	keywords = {bivalvia, mollusca, monopteria, paleontology, pterinea, pterioida, pterioidea, taxonomy},
	author = {Worthen, A. H.}
}
@book {6327,
	title = {Carbonformation und Dyas in Nebraska},
	year = {1866},
	note = {PDFPteiroidea: pp. 28-33 [pp. 45-50 of the PDF], pl. 2 [p. 115 of the PDF].[Journal (?): Kaiserliche Leopoldinisch-Carolinische Deutsche Akademie Naturforscher Verhandlungen]},
	pages = {92},
	publisher = {Druck von E. Blochmann \& Sohn},
	organization = {Druck von E. Blochmann \& Sohn},
	address = {Dresden},
	keywords = {avicula, bakevellia, bakevelliidae, bivalvia, carboniferous, fossil record, gervillia, mollusca, Pteria, pteriidae, pterioidea, taxonomy},
	author = {Geinitz, H. B.}
}
@book {1697,
	title = {Pal{\ae}ontology},
	series = {Geological Survey of Illinois},
	volume = {2},
	year = {1866},
	publisher = {Authority of the Legislature of Illinois},
	organization = {Authority of the Legislature of Illinois},
	address = {Chicago},
	keywords = {bivalvia, mollusca, monopteria, paleontology, pterinea, pterioida, pterioidea, taxonomy},
	author = {Worthen, A. H.}
}
