@article {6221,
	title = {Systematics and evolution of <i>Phacops rana</i> (Green, 1832) and <i>Phacops iowensis </i>Delo, 1935 (Trilobita) from the middle Devonian of North America},
	journal = {Bulletin of the American Museum of Natural History},
	volume = {147},
	number = {2},
	year = {1972},
	note = {Do NOT HAVE},
	pages = {47-113},
	keywords = {devonian, evolution, paleozoic, trilobita},
	author = {Eldredge, Niles}
}
