Columbia subject headings:
Ecocriticism.
Human ecology in literature.
Humanism.
Landscapes in literature.
Nature in literature.
Harvard subject headings:
Ecocriticism.
Human ecology in literature
Humanism.
Landscapes in literature.
Nature in literature.
Princeton subject headings:
Ecocriticism.
Human ecology in literature.
Humanism.
Landscapes in literature.
Nature in literature.