@inbook {Stephenson1916,
	title = {Systematic Paleontology, Upper Cretaceous: Coelenterata},
	booktitle = {Maryland Geological Survey: Upper Cretaceous},
	year = {1916},
	pages = {752{\textendash}757},
	publisher = {Johns Hopkins Press},
	organization = {Johns Hopkins Press},
	address = {Baltimore},
	keywords = {RCBS, TIP},
	url = {http://archive.org/details/uppercretaceous02maryrich},
	author = {Stephenson, Lloyd William},
	editor = {Clark, William Bullock}
}
@book {Clark1901,
	title = {The Eocene Deposits of Maryland},
	year = {1901},
	pages = {331},
	publisher = {Johns Hopkins Press},
	organization = {Johns Hopkins Press},
	address = {Baltimore},
	keywords = {RCBS, TIP},
	url = {http://books.google.com/books?id=NdK7AAAAIAAJ},
	author = {Clark, William Bullock and Martin, George Curtis}
}
