Sphenophyllum: References & Edit History
Article Contributors
Primary Contributors
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Nan Crystal Arens
Professor of Geoscience, Hobart and William Smith Colleges, Geneva, New York.
Other Encyclopedia Britannica Contributors
Article History
| Type | Description | Contributor | Date |
|---|---|---|---|
| Add new Web site: Czech Geological Survey - Partial Reconstruction and Palaeoecology. | Nov 02, 2016 | ||
| Article revised and updated. | Jul 16, 2008 | ||
| Article added to new online database. | Jul 20, 1998 |
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