Spatial Coverage
- Saint Lawrence River.3
- Arizona2
- Colorado River (Colo.-Mexico)2
- Colorado River.2
- Florida2
- Grand Canyon (Ariz.)2
- Hawaii2
- Maritime Provinces2
- Maritime Provinces.2
- Mississippi River Valley2
- New England.2
- New Spain2
- Niagara Falls (N.Y. and Ont.)2
- Niagara Falls Region (N.Y.)2
- Niagara Falls Region.2
- Niagara Falls.2
- Niagara River (N.Y. and Ont.)2
- Niagara River Valley (N.Y. and Ont.)2
- Niagara River Valley.2
- Niagara River.2
