Columbia subject headings:
Harvard subject headings:
Strikes and lockouts--Germany--Hesse--History--Sources.
Strikes and lockouts--Hesse-Kassel (Electorate)--History--Sources.
Thirty-five hour week--Germany--Hesse--History--Sources.
Thirty-five hour week--Hesse-Kassel (Electorate)--History--Sources.
Princeton subject headings:
Strikes and lockouts--Germany (West)--Hesse--History--Sources.
Thirty-four hour week--Germany (West)--Hesse--History--Sources.