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Subject
- Boundaries2
- Inland Waters[remove]2
- Protected areas[remove]2
- Wilderness areas2
- Battlefields1
- Biology and Ecology1
- Environment1
- Farming1
- Forest reserves1
- Historic parks1
- Historic sites1
- Military1
- Military parks1
- National parks and reserves1
- Natural areas1
- Public lands1
- Society1
- Transportation1
- Wilderness area monitoring1