Keywords: Cincinnati Quart. J. Sci. 2 274 fig 18a-b.jpg of a New Species of Trilobite Cincinnati Quarterly Journal of Science 2 274 fig 18a-b http //babel hathitrust org/cgi/pt id mdp 39015057227525 Michigan/Google 1875 Creator Charles Doolittle Walcott PD-old-80 Works by Charles Doolittle Walcott |