Columbia subject headings:
Environmental ethics--Congresses.
Nature--Religious aspects--Congresses.
Religion and science--History--20th century--Congresses.
Harvard subject headings:
Environmental ethics--Congresses.
Environmental ethics.
Nature--Religious aspects--Christianity
Nature--Religious aspects--Christianity--Congresses.
Religion and science--1946-
Religion and science--1946---Congresses.
Princeton subject headings: