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Growth in Two Populations of the Crinoid Eucalyptocrinites crassus; Observations on Evolution of Calycine Appendages in the Crinoid Gilbertsocrinus; A Cystoid Plate from the Lower Part of the Petoskey Formation
(Museum of Paleontology, The University of Michigan, 1973)
Evolution of Middle Devonian Species of Euglyphella as Indicated by Cladistic Analysis
(Museum of Paleontology, The University of Michigan, 1973)