Columbia subject headings:
Industrial sociology--Europe, Eastern.
Social classes--Europe, Eastern.
Working class--Europe, Eastern.
Harvard subject headings:
Industrial sociology--Europe, Eastern.
Industrial sociology--Poland.
Social classes--Europe, Eastern
Social classes--Poland
Working class--Europe, Eastern
Working class--Poland.
Princeton subject headings:
Industrial sociology--Europe, Eastern.
Labor--Europe, Eastern.
Social classes--Europe, Eastern.