On some extinct reptiles and batrachia from the Judith River and Fox Hills beds of Montana Author Cope, E. D. text Proceedings of the Academy of Natural Sciences of Philadelphia 1876 1876-12-31 28 340 359 journal article 26021 10.5281/zenodo.3368363 6de1cdbb-5c8e-4f58-b9e0-1790503ef0a5 3368363 Laelaps explanatus , Cope, Proceedings Academy, October, 1876.