Liassic and Rhaetic Plants collected in 1936-38 from East Greenland, etc. (Copenhague, 1946).
Conifers of the Taxiodiaceæ from the Wealden Formation of Belgium, etc. (Bruxelles, 1953).
The Yorkshire Jurassic flora (cinq volumes, Londres, 1961-1979).
Source
Allen G. Debus (dir.), World Who’s Who in Science. A Biographical Dictionary of Notable Scientists from Antiquity to the Present, Marquis-Who’s Who, Chicago, 1968, XVI-1855 p.