A remarkable fossil Selaginella with preserved female gametophytesWilliam C. Darrah · First published 1938Open the Tome
Permian elements in the fossil flora of the Appalachian provinceWilliam C. Darrah · First published 1935Open the Tome
Recent paleobotanic investigations near Pittsburgh, PennsylvaniaWilliam C. Darrah · First published 1932Open the Tome