Spatial Coverage
- Kiel Canal1
- Kiel Canal (Germany)1
- Leadville1
- Leadville (Colo.)1
- Livingston County1
- Livingston County (N.Y.)1
- London1
- Maine1
- Marble Hill (New York, N.Y.)1
- Marble Hill.1
- Maricopa County1
- Maricopa County (Ariz.)1
- Massachusetts.1
- McMinn County1
- Meigs County1
- Mexico1
- Michigan1
- Middle Atlantic States1
- Monroe County1
- Monroe County (N.Y.)1
