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ADDITIONAL CRINOID SPECIMENS FORM THE SHELLROCK FORMATION (UPPER DEVONIAN) OF IOWA.STRIMPLE HL; LEVORSON CO.1973; PROC. IOWA ACAD. SCI.; USA; 1973, VOL. 80, NUM. 0004, P. 182 A 184Serial Issue

NEW FLEXIBLE CRINOIDS FROM THE UPPER DEVONIAN OF NORTH CENTRAL IOWA.STRIMPLE HL; LEVORSON CO.1971; PROC. IOWA ACAD. SCI.; USA; 1971, VOL. 78, NUM. 0001, P. 9 A 11Miscellaneous

CATALOGUE OF TYPE SPECIMENS OF THE BELANSKI COLLECTION.STRIMPLE HL; LEVORSON CO.1969; BULL. AMER. PALEONTOL.; USA; 1969, VOL. 56, NUM. 0251, P. 259 A 271Miscellaneous

TWO UPPER DEVONIAN CRINOIDS.STRIMPLE HL; LEVORSON CO.1969; UNIV. KANSAS PALEONTOL. CONTRIB., PAPER; USA; 1969(10), NUM. 0042, P. 17 A 20Miscellaneous

REVISION OF THE ORDOVICIAN CARPOID FAMILY IOWACYSTIDAE.KOLATA DR; STRIMPLE HL; LEVORSON CO et al.1977; PALAEONTOLOGY; G.B.; DA. 1977; VOL. 20; NO 3; PP. 529-557; H.T. 3; BIBL. 1 P.; 14 ILL.Article

A NEW SPECIES OF BOTHRIOCIDARIS (ECHINOIDEA) FROM THE CINCINNATIAN MAQUOKETA GROUP OF IOWA.KOLATA DR; STRIMPLE HL; LEVORSON CO et al.1977; PROC. IOWA ACAD. SCI.; U.S.A.; DA. 1977; VOL. 84; NO 4; PP. 146-149; BIBL. 7 REF.; 2 ILL.Article

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

STRATIGRAPHY OF THE DUBUQUE FORMATION (UPPER ORDOVICIAN) IN IOWALEVORSON CO; GERK AJ; BROADHEAD TW et al.1979; PROC. IOWA ACAD. SCI.; USA; DA. 1979; VOL. 86; NO 2; PP. 57-65; BIBL. 2 P.; 3 ILL.Article

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