E. Hitchcock. 1858. Ichnology of New England. A Report on the Sandstone of the Connecticut Valley, Especially its Fossil Footmarks, Made to the Government of the Commonwealth of Massachusetts
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Bibliographie (1)
R. S. Lull. 1904. Fossil footprints of the Jura-Trias of North America. Memoirs of the Boston Society of Natural History 5(11):461-557