sewer: References & Edit History
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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 Contributors
Other Encyclopedia Britannica Contributors
Article History
| Type | Description | Contributor | Date |
|---|---|---|---|
| Media added. | Oct 13, 2025 | ||
| Article thoroughly revised. | Feb 01, 2010 | ||
| Article revised and updated. | Jan 22, 2010 |
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