Frank Hall Knowlton: References & Edit History
Article Contributors
Primary Contributors
-
The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.
Other Encyclopedia Britannica Contributors
Article History
| Type | Description | Contributor | Date |
|---|---|---|---|
| Anniversary information added. | Nov 18, 2025 | ||
| Anniversary information added. | Aug 29, 2025 | ||
| First paragraph modernization. | Apr 19, 2024 | ||
| Geologic time data updated. | Sep 15, 2009 | ||
| New article added. | Oct 23, 2007 |
View Changes:
Article History
Revised:
By: