A revision of the fossil ferns from the Potomac group which have been referred to the genera Cladophlebis and Thyrsopteris
| Image |  |
|---|---|
| Description | |
| Author/s |
author: Edward Wilber Berry |
| Publication date | 1911 |
| Language | |
| Country of origin | |
| Wikipedia link | |
| Copyright status |
public domain in United States. |
| Missing/wrong data? | Edit Wikidata item |