Pteridosperm Male Fructifications; American Species of Dolerotheca, With Notes Regarding Certain Allied Forms; Report of Investigations No. 14260bladzijden3 uur lezenVolgen
An Annotated Synopsis of Paleozoic Fossil Spores: and the Definition of Generic Groups; Report of Investigations No. 9180bladzijden3 uur lezenVolgen
Contributions to Pennsylvanian Paleobotany Mazocarpon Oedipternum, Sp. Nov. and Sigillarian Relationships; Report of Investigations No. 7556bladzijden2 uur lezenVolgen
