Columbia subject headings:
Hesse (Germany)--History--1918---Sources.
Hesse (Germany)--Politics and government--Sources.
Harvard subject headings:
Hesse (Germany)--Politics and government--Sources.
Hesse-Darmstadt (Germany). Landtag--History--20th century--Sources.
Princeton subject headings:
Hesse-Darmstadt (Germany)--Politics and government--Sources.
Hesse-Darmstadt (Germany). Landtag--History--20th century--Sources.