Author: BROADHEAD, T.W. & H.L. STRIMPLE
Title: Systermatics and distribution of the Callosystitidae (Echinoderma, Rhombifera). [Ordovician]
Description: 1978. Journal of Paleontology Vol. 52, No. 1; pp. 164-177, 4 fig./phot. 1 plt. Attachedf short paper on on a new Pennsylv. echinoid: pp.155-163. Orig. wrps. stapled extract, very good.

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