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|Wikimedia Commons has media related to 1866 establishments.|
Organizations, places or other things founded or established in the year 1866.
|1860s establishments:||← 1860–1861–1862–1863–1864–1865–1866–1867–1868–1869 →|
This category has only the following subcategory.
- ► 1866 establishments in the United States (1 C, 7 P)