Columbia subject headings:
Harvard subject headings:
Gewerkschaft der Polizei (Germany)
Gewerkschaft der Polizei (Germany). Preußen Königreich.
National socialism.
Police--Germany--History--20th century.
Police--Germany--Prussia--History--20th century.
Police--Labor unions--Germany--History--20th century.
Police--Labor unions--Germany--Prussia--History--20th century.
Princeton subject headings:
Gewerkschaft der Polizei (Germany)
Gewerkschaft der Polizei (Germany). Preussen Königreich.
National socialism.
Police--Germany--History--20th century.
Police--Germany--Prussia--History--20th century.
Police--Labor unions--Germany--History--20th century.
Police--Labor unions--Germany--Prussia--History--20th century.