Columbia subject headings:
Industrial laws and legislation--Czechoslovakia--Congresses.
Industrial laws and legislation--Germany (East)--Congresses.
Industrial laws and legislation--Poland--Congresses.
Trusts, Industrial--Czechoslovakia--Congresses.
Trusts, Industrial--Germany (East)--Congresses.
Trusts, Industrial--Poland--Congresses.
Harvard subject headings:
Industrial laws and legislation--Czechoslovakia--Congresses.
Industrial laws and legislation--Germany (East)--Congresses.
Industrial laws and legislation--Poland--Congresses.
Princeton subject headings: