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EDRIOASTEROIDS (ECHINODERMATA) OF THE MAQUOKETA FORMATION OF IOWA.BELL BM; STRIMPLE HL; LEVORSON CO et al.1976; PROC. IOWA ACAD. SCI.; U.S.A.; DA. 1976; VOL. 83; NO 1; PP. 23-27; BIBL. 14 REF.; 2 ILL.Article