coal ball: References & Edit History
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Article History
| Type | Description | Contributor | Date |
|---|---|---|---|
| Changed “the Ukraine” to “Ukraine.” | Mar 09, 2022 | ||
| Add new Web site: Emporia State University - Coal Balls: A Key to Ancient Plants. | Mar 16, 2018 | ||
| Added new Web site: Department of Environment and Plant Biology at Ohio University - Coal Ball. | Sep 18, 2007 | ||
| Article added to new online database. | Jul 20, 1998 |
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