Columbia subject headings:
Land tenure--Spain--History--Congresses.
Landowners--Spain--History--Congresses.
Peasants--Spain--History--Congresses.
Harvard subject headings:
Land tenure--Spain--History--Congresses.
Landowners--Spain--History--Congresses.
Peasants--Spain--History--Congresses.
Princeton subject headings:
Agriculture--Economic aspects--Spain--Congresses.
Agriculture--Social aspects--Spain--History--Congresses.
Feudalism--Spain--History--Congresses.
Land tenure--Spain--History--Congresses.
Nobility--Spain--History--Congresses.
Peasants--Spain--History--Congresses.
Rural population--Spain--History--Congresses.
Social classes--Spain--History--Congresses.
Spain--Rural conditions--Congresses.