Microscopic chondrichthyan remains from Pennsylvanian marine rocks of Ohio and adjacent areas. Unpublished PhD thesis, Ohio State University, Columbus, Ohio. 2 vols. 514pp.
Reconstruction of the Head Skeleton of the Fossil Elasmobranch, Phoebodus heslerorum (Pisces, Chondrichthyes). Copeia, 1988(4), 858–866