Columbia subject headings:
Christian union--Europe--Congresses.
Christianity and justice--Congresses.
Christianity--Europe--Congresses.
Environmental ethics.
Peace--Religious aspects--Christianity--Congresses.
Harvard subject headings:
Christian union--Europe--Congresses.
Christianity and justice--Congresses.
Christianity--Europe--Congresses
Human ecology--Religious aspects--Christianity--Congresses.
Peace--Religious aspects--Christianity--Congresses.
Princeton subject headings: