@article {Lyell1837,
	title = {On the Cretaceous and Tertiary strata of the Danish islands of Seeland and M{\"o}en},
	journal = {Transactions of the Geological Society of London, Series 2},
	volume = {5},
	year = {1837},
	pages = {243{\textendash}257},
	keywords = {SDC, TIP},
	doi = {10.1144/transgslb.5.1.243},
	url = {http://trn.lyellcollection.org.proxy.lib.uiowa.edu/content/s2-5/1/243},
	author = {Lyell, Charles}
}
@book {Bronn1837a,
	title = {Lethaea Geognostica. Erster Band},
	year = {1837},
	pages = {1{\textendash}544},
	publisher = {E. Schweizerbart},
	organization = {E. Schweizerbart},
	address = {Stuttgart},
	keywords = {BL, TIP},
	url = {http://archive.org/details/lethaeageognosti01bron},
	author = {Bronn, Heinrich Georg}
}
@book {Bronn1837,
	title = {Leth{\"a}a Geognostica. Tafeln},
	volume = {3},
	year = {1837},
	pages = {16, 47 pl.},
	publisher = {E. Schweizerbart},
	organization = {E. Schweizerbart},
	address = {Stuttgart},
	keywords = {RCBS, SDC, TIP},
	url = {http://archive.org/details/lethaeageognosti1837bron},
	author = {Bronn, Heinrich Georg}
}
