Transkription:
Fontaine William Morris
The Potomac or younger mesozoic flora.
P. 1 [Texl] 2 [Plates
Se:
Survey
Geol
Fol.
Iust. N.Amer.
4º Washington 1889.
Washingem. U. S. geol. surverg
United States geological,. Monographs. Vol. 15.
Geol.
Taleont.
Vaxt.