Columbia subject headings:
Land reform--Political aspects--Spain--Peralta (Navarre)--History--20th century.
Land tenure--Spain--Peralta (Navarre)--History--20th century.
Social conflict--Spain--Peralta (Navarre)--History--20th century.
Working class--Political activity--Spain--Peralta (Navarre)--History--20th century.
Harvard subject headings:
Agriculture and state--Spain--Peralta.
Peralta (Spain)--History.
Peralta (Spain)--Social conditions.
Spain--Politics and government--1886-1931.
Princeton subject headings: