Columbia subject headings:
Environmental law, International--Congresses.
Environmental law--European Union countries--Congresses.
Environmental law--Germany--Congresses.
Standardization--Law and legislation--Congresses.
Standardization--Law and legislation--European Union countries--Congresses.
Standardization--Law and legislation--Germany--Congresses.
Harvard subject headings:
Environmental law, International--Congresses.
Environmental law--European Union countries--Congresses
Environmental law--Germany--Congresses.
Standardization--Law and legislation--Congresses.
Standardization--Law and legislation--European Union countries--Congresses.
Standardization--Law and legislation--Germany--Congresses.
Princeton subject headings: