Oliver Perry Hay: References & Edit History
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Article History
| Type | Description | Contributor | Date |
|---|---|---|---|
| Anniversary information added. | May 18, 2026 | ||
| Anniversary information added. | Oct 29, 2025 | ||
| First paragraph modernization. | Mar 12, 2024 | ||
| Add new Web site: Smithsonian Institution Archives - Biography of Oliver Perry Hay. | Jun 10, 2018 | ||
| Geologic time data updated. | Sep 15, 2009 | ||
| Article added to new online database. | Jul 20, 1998 |
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