Columbia subject headings:
Human ecology--Congresses.
Social sciences--Data processing--Congresses.
Social sciences--Research--Congresses.
Harvard subject headings:
Human ecology--Congresses
Social sciences--Data processing--Congresses.
Social sciences--Research--Congresses
Princeton subject headings:
Human ecology--Congresses.
Social sciences--Data processing--Congresses.
Social sciences--Research--Congresses.