Columbia subject headings:
Anarchism--Spain--Aragon--History.
Aragon (Spain)--History.
Collective farms--Spain--Aragon--History.
Spain--History--Civil War, 1936-1939.
Syndicalism--Spain--Aragon--History.
Harvard subject headings:
Anarchism--Spain--Aragon--History.
Aragon (Spain)--History.
Collective farms--Spain--Aragon--History.
Spain--History--Civil War, 1936-1939.
Syndicalism--Spain--Aragon--History.
Princeton subject headings:
Anarchism--Spain--Aragon.
Anarchists--Spain--Aragon.
Spain--History--Civil War, 1936-1939.
Spain--Politics and government--1931-1939.