Fell, H. B. & Pawson, D. L. 1966. Echinacea. Pp. U367-U440 in R. C. Moore (ed.) Treatise on Invertebrate Paleontology, U. Echinodermata. 3 (2) GSA & Univ. Kansas Press, Boulder, CO & Lawrence, KS.
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Fell, H. B.; Pawson, D. L.
1966
Echinacea. Pp. U
Treatise on Invertebrate Paleontology, U. Echinodermata