1. Megaspores from the Michigan Coal Basin;Contributions from the Museum of Palaeontology, University of Michigan,1950
2. On some Spore Specimens from British Upper Carboniferous Coals
3. The stratigraphical significance of certain fossil spores in the central British coalfields;Transactions of the Institute of Mining Engineers (London),1952
4. The spore flora of Velener schichten (Lower Westphalian D) in the Ruhr Coal Measures;Palaeontographica,1957
5. Densosporites (Berry) Potonié & Kremp and related genera;Butterworth,1964