Columbia subject headings:
Industries--Germany--Halle an der Saale.
Manufacturing industries--Germany--Halle an der Saale.
Working class--Germany--Halle an der Saale.
Harvard subject headings:
Industries--Germany--Halle an der Saale.
Manufactures--Germany--Halle an der Saale.
Working class--Germany--Halle an der Saale.
Princeton subject headings: