@book {Roemer1852,
	title = {Die Kreidebildungen von Texas und ihre organischen Einschl{\"u}sse},
	year = {1852},
	pages = {100, 11 pl.},
	publisher = {Adolph Marcus},
	organization = {Adolph Marcus},
	address = {Bonn},
	keywords = {RCBS, TIP},
	url = {http://archive.org/details/diekreidebildung00roem},
	author = {Roemer, C Ferdinand}
}
@book {Quenstedt1852,
	title = {Handbuch der Petrefaktenkunde},
	year = {1852},
	pages = {792, 62 pl.},
	publisher = {H. Laupp},
	organization = {H. Laupp},
	edition = {1},
	address = {T{\"u}bingen},
	keywords = {BL, RCBS, TIP},
	url = {http://books.google.com/books?id=gMoQAAAAIAAJ},
	author = {Quenstedt, Friedrich August}
}
@book {D{\textquoteright}Orbigny1852,
	title = {Prodrome de pal{\'e}ontologie stratigraphique universelle des animaux mollusques et rayonn{\'e}s. Troisi{\`e}me volume},
	year = {1852},
	pages = {189},
	publisher = {Victor Masson},
	organization = {Victor Masson},
	url = {http://archive.org/details/prodromedepalo03orbiuoft},
	author = {D{\textquoteright}Orbigny, Alcide}
}
@article {Catullo1852,
	title = {Cenni sopra il terreno di sedimento superiore delle Provincie Venete e descrizione di alcune specie di polipai fossili ch{\textquoteright}esso racchiude},
	journal = {Memorie del Reale Istituto Veneto di Scienze, Lettere ed Arti},
	volume = {4},
	year = {1852},
	pages = {1{\textendash}44, pl. 1{\textendash}4},
	keywords = {RCBS, TIP},
	url = {http://archive.org/details/memoriedelrealei04isti},
	author = {Catullo, Tomaso Antonio}
}
