The Potomac Or Younger Mesozoic Flora: Volume 15, Part 1

The Permian Or Upper Carboniferous Flora of West Virginia and S. W. Pennsylvania: Page 2

Status of the Mesozoic Floras of the United States: Text

Contributions Toward a Monograph of the Noctuidæ of Boreal America: Revision of the Genus Cucullia; Revision of the Dicopinæ; Revision of Xylomiges and Morrisonia, Volume 15