Spatial Coverage
- Maine.1
- Marquette1
- Marquette Bay (Marquette County, Mich.)1
- Massachusetts Bay (Mass.)1
- Massachusetts.1
- Massachussetts1
- Matagorda Bay.1
- Mattaponi River (Va.)1
- Maui (Hawaii)1
- Michigan, Lake.1
- Milford1
- Missisquoi River (Vt. and Québec)1
- Mississippi1
- Mississippi River1
- Mississippi River Valley1
- Mississippi Sound1
- Nantucket Sound (Mass.)1
- Nantucket Sound.1
- Nevada1
- New England1
