1. Megaspores from the Michigan Coal Basin;Arnold;Contrib. Mus. Paleontol. Univ. Mich.,1950
2. Re-examination of Triletes superbus, T. rotatus, and T. mamillarius of Bartlett;Arnold;Brittonia,1961
3. Fossils of the Carboniferous coal pebbles of the glacial drift at Ann Arbor;Bartlett;Pap. Mich. Acad.,1929
4. Lycopod succession in coals: an example from the Low Barnsley Seam (Westphalian B), Yorkshire, England;Bartram,1987
5. On the occurrence of spores in the Carboniferous formation of Scotland;Bennie,1886