au.\*:("LEVORSON CO")
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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
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