@article {611,
	title = {On Cardiocarpon and some associated plant remains from Iowa coal fields},
	journal = {Botanical Gazette},
	volume = {108},
	year = {1946},
	pages = {51-64},
	chapter = {51},
	author = {Reed, F.D.}
}
@article {501,
	title = {Cordaixylon dumusum n.sp. (Cordaitales). I. Vegetative Structures},
	journal = {Botanical Gazette},
	volume = {145},
	year = {1984},
	pages = {275-291 },
	chapter = {275},
	url = {http://www.jstor.org/pss/2474349},
	author = {Rothwell, Gar W. and Warner, Susan}
}
