Paleobotanical Studies in Arctic Canada I. Archaeopteris from Ellesmere Island - 1965
Azolla primaeva and its phylogenetic significance - 1967
Vegetative remains of Azolla schopfii Dijkstra from Genesee, Alberta - 1973
A detailed study of the genus Azollopsis - 1974
A new fossil plant of probable intermediate affinities (Trimerophyte-Progymnosperm) - 1975
Rhymokalon, A New Plant with Cladoxylalean Anatomy from the Upper Devonian of New York State - 1975
New occurences of trimerophytes from the Devonian of eastern Canada - 1978
Ontogeny of Progymnosperms. II. Shoots of Upper Devonian Archaeopteridales - 1978
A new species of Psilophyton from the Lower Devonian of northern New Brunswick, Canada - 1980
Stenomyelon from the Upper Tournaisian of the Montagne Noire (France) - 1984
Fossil flowers and leaves of the Ebenaceae from the Eocene of southern Australia - 1985
A neotype for Drepanophycus spinaeformis Goppert 1852 - 2000
Fossil Flowers and Fruits of Capsular Myrtaceae from the Eocene of South Australia - 2007