Columbia subject headings:
Harvard subject headings:
Associations, institutions, etc.--Germany.
Associations, institutions, etc.--Netherlands.
Social participation--Germany.
Social participation--Netherlands.
Sports--Germany--Societies, etc.
Sports--Netherlands--Societies, etc.
Voluntarism--Germany.
Voluntarism--Netherlands.
Princeton subject headings:
Associations, institutions, etc.--Germany.
Associations, institutions, etc.--Netherlands.
Social participation--Germany.
Social participation--Netherlands.
Sports--Germany--Societies, etc.
Sports--Netherlands--Societies, etc.
Voluntarism--Germany.
Voluntarism--Netherlands.