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Subject
- Natural areas[remove]38
- Environment19
- Boundaries15
- Parks13
- Open spaces11
- Society9
- Recreation areas7
- Wilderness areas7
- Beaches5
- Inland Waters4
- National parks and reserves4
- Biogeography3
- Biology and Ecology3
- Conservation of natural resources3
- Ecological zones3
- Forests and forestry3
- Natural resources3
- Public lands3
- Seashore3
- Special districts3