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Subject
- Lakes & ponds10
- Mead, Lake (Ariz. and Nev.)10
- Mountains5
- Air travel4
- Coastlines4
- Deserts4
- Electric lines4
- Dams3
- Hills3
- Islands3
- Rivers3
- Black Canyon (Ariz. and Nev.)2
- Bodies of water2
- Boulder Canyon (Ariz. and Nev.)2
- Boulder Dam (Ariz. and Nev.)2
- Canyons2
- Cliffs2
- Hoover Dam (Ariz. and Nev.)2
- Hydroelectric generators2
- Hydroelectric power2