Columbia subject headings:
Harvard subject headings:
Farmers--Europe--History--Congresses.
Farmers--Germany--History--Congresses.
Peasants--Europe--History--Congresses.
Peasants--Germany--History--Congresses.
Self-perception--Europe--History--Congresses.
Princeton subject headings:
Farmers--Europe--History.
Farmers--Germany--History.
Peasants--Europe--History.
Peasants--Germany--History.