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Common Flicker, Marsh River Bog Preserve, Newcastle (April 2009)
| 3rd Monday | Patriots Day in Maine and Massachusetts commemorates the battles of Lexington and Concord, fought near Boston in 1775. | ||
| 1844 | First publication of the newspaper Daily Mercury in Bangor, published by W. Bartlett. | ||
| 1943 |
Brunswick Naval Air Station commissioned |
| 1968 | Henry Beston, author and naturalist, dies |
| 2015 | Portland single-use bag fee and polystyrene ban begins; other municipalities eventually follow. |