Columbia subject headings:
Harvard subject headings:
Refuse and refuse disposal, Rural--Western countries--History--Congresses.
Refuse and refuse disposal--Western countries--History--Congresses.
Refuse collection--Western countries--History--Congresses.
Princeton subject headings:
Refuse and refuse disposal, Rural--Western countries--History--Congresses.
Refuse and refuse disposal--Western countries--History--Congresses.
Refuse collection--Western countries--History--Congresses.