Columbia subject headings:
Harvard subject headings:
Harbor personnel--Germany--Hamburg--History.
Harbors--Technological innovations--Germany--Hamburg--History.
Stevedores--Germany--Hamburg--History.
Stevedores--Germany--Hamburg--Social conditions.
Work environment--Germany--Hamburg--History.
Princeton subject headings:
Harbor personnel--Germany--Hamburg--History.
Harbors--Technological innovations--Germany--Hamburg--History.
Stevedores--Germany--Hamburg--History.
Stevedores--Germany--Hamburg--Social conditions.
Work environment--Germany--Hamburg--History.