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- Ecology in literature (5)
- Environmental protection in literature (5)
- Landscape in literature (5)
- Nature in literature (5)
- American literature--History and criticism (4)
- Wilderness areas in literature (4)
- Conservation of natural resources in literature (3)
- English literature--History and criticism (2)
- Environmental policy in literature (2)
- Forests and forestry in literature (2)
- Outdoor life in literature (2)
- Philosophy of nature in literature (2)
- Children's literature, American--History and criticism (1)
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- Children--Books and reading--English-speaking countries (1)
- Ecocriticism (1)
- Environmental literature--United States--History and criticism (1)
- Nature conservation in literature (1)