Specer, R.S., 1967, Univ. Kans. Paleontol. Contrib. Paper 14, p. 1-35, Fig. 1-22: Pennyslvanian Spiriferacea and Spiriferinacea of Kansas.
© Copyright 2011. Division of Invertebrate Paleontology, University of Kansas.
To log in to the site, you will need your Biodiversity Institute domain username and password. If you do not know this username and password, contact the help desk at 785.864.4684 or firstname.lastname@example.org