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Subject
- Boundaries[remove]42
- Counties28
- Administrative and political divisions10
- Society7
- States4
- Protected areas3
- School districts3
- Wilderness areas3
- Biology and Ecology2
- Elementary schools2
- Environment2
- High schools2
- Inland Waters2
- Junior high schools2
- Middle schools2
- Wilderness area monitoring2
- Battlefields1
- Farming1
- Forest reserves1
- Historic parks1