Description of coal flora of the Carboniferous formation in Pennsylvania and throughout the United States /

Includes index."Literature of the U.S. coal flora": p. 685-694.Vol. 1 has half-title: Coal flora of Pennsylvania.Paged continuously.v. 1. Cellular cryptogamous plants, fungi, thalassophytes. Vascular cryptogamous plants, Calamarioe, Filicaceoe (ferns) -- v. 2. Lycopodiacea. Sigilarioe. Gymnosperms. -- v. 3. [Additions and corrections of the first and second volumes with plates additional to atlas]Mode of access: Internet