Columbia subject headings:
Life change events--Congresses.
Life cycle, Human--Congresses.
Social change--Congresses.
Social institutions--Congresses.
Harvard subject headings:
Life change events--Congresses.
Life cycle, Human--Congresses
Social change--Congresses
Social institutions--Congresses.
Princeton subject headings:
Life change events--Congresses.
Life cycle, Human--Congresses.
Social change--Congresses.
Social institutions--Congresses.