Contributions to the history of the Vertebrata of the Lower Eocene of Wyoming and New Mexico, made during 1881. Cope, E. D. Proceedings of the American Philosophical Society, 20:139–197, 1882.
bibtex   
@article{cope_contributions_1882,
	title = {Contributions to the history of the {Vertebrata} of the {Lower} {Eocene} of {Wyoming} and {New} {Mexico}, made during 1881},
	volume = {20},
	journal = {Proceedings of the American Philosophical Society},
	author = {Cope, Edward Drinker},
	year = {1882},
	pages = {139--197},
}

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