Columbia subject headings:
Harvard subject headings:
Aragon (Spain)--History.
Collectivization of agriculture--Spain--Cretas.
Cretas (Spain)--Economic conditions--20th century.
Cretas (Spain)--History--20th century.
Spain--History--Civil War, 1936-1939.
Princeton subject headings:
Cretas (Spain)--Economic conditions.
Cretas (Spain)--Rural conditions.
Cretas (Spain)--Social conditions.
Peasants--Spain--Cretas--Political activity.
Spain--History--Civil War, 1936-1939.