Columbia subject headings:
Harvard subject headings:
Interdisciplinary approach in education--Congresses.
Scouting (Youth activity)--History--Congresses.
Scouts (Youth organization members)--History--Congresses.
Princeton subject headings:
Interdisciplinary approach in education--Congresses.
Scouting (Youth activity)--History--Congresses.
Scouts (Youth organization members)--History--Congresses.