Columbia subject headings:
Harvard subject headings:
Ecocriticism--Congresses.
Ecology in literature--Congresses.
Environment (Aesthetics)--Congresses.
Environmental ethics--Congresses.
Environmentalism in literature--Congresses.
Princeton subject headings:
Ecocriticism--Congresses.
Ecology in literature--Congresses.
Environment (Aesthetics)--Congresses.
Environmental ethics--Congresses.