Columbia subject headings:
Fire--Symbolic aspects--Congresses.
Natural history--Congresses.
Nature and civilization--Congresses.
Water--Symbolic aspects--Congresses.
Harvard subject headings:
Fire--Religious aspects--Congresses.
Fire--Symbolic aspects--Congresses.
Natural history--Congresses
Nature and civilization--Congresses.
Water--Religious aspects--Congresses.
Water--Symbolic aspects--Congresses.
Princeton subject headings:
Fire--Religious aspects--Congresses.
Fire--Symbolic aspects--Congresses.
Water--Religious aspects--Congresses.
Water--Symbolic aspects--Congresses.