Columbia subject headings:
Hesse (Germany)--Historiography--Congresses.
Hesse (Germany)--History--Congresses.
Historians--Germany--Hesse--Congresses.
Harvard subject headings:
Cities and towns--Germany--Hesse--History--Sources.
Hesse (Germany)--Historiography--Congresses.
Hesse (Germany)--History--Congresses.
Hesse (Germany)--History--Sources.
Historians--Germany--Hesse--Congresses.
Princeton subject headings:
Hesse (Germany)--Historiography--Congresses.
Hesse (Germany)--History--Congresses.
Historians--Germany--Hesse--Congresses.