Columbia subject headings:
Industrial efficiency--Europe, Central--Congresses.
Industrial efficiency--Europe, Eastern--Congresses.
Industries--Environmental aspects--Europe, Central--Congresses.
Industries--Environmental aspects--Europe, Eastern--Congresses.
Production engineering--Europe, Central--Safety measures--Congresses.
Production engineering--Europe, Eastern--Safety measures--Congresses.
Harvard subject headings:
Environmental auditing--Europe, Central--Congresses.
Environmental auditing--Europe, Eastern--Congresses.
Industrial efficiency--Europe, Central--Congresses.
Industrial efficiency--Europe, Eastern--Congresses.
Industries--Environmental aspects--Europe, Central--Congresses.
Industries--Environmental aspects--Europe, Eastern--Congresses.
Princeton subject headings:
Industrial efficiency--Europe, Central--Congresses.
Industrial efficiency--Europe, Eastern--Congresses.
Industries--Environmental aspects--Europe, Central--Congresses.
Industries--Environmental aspects--Europe, Eastern--Congresses.
Production engineering--Europe, Central--Safety measures--Congresses.
Production engineering--Europe, Eastern--Safety measures--Congresses.