Columbia subject headings:
Harvard subject headings:
Agricultural colonies--Spain.
Cistercians--Spain.
Douro (Spain)--History--Sources.
Monasterio de Santa María de Moreruela (Zamora, Spain)
Monasterio de Santa María de Moreruela--History--Sources.
Monasticism and religious orders--Spain--History--Middle Ages, 600-1500.
Moreruela (Spain)--Church history.
Spain--Economic conditions--History--Sources.
Princeton subject headings:
Agricultural colonies--Spain--History--Sources.
Cistercians--Spain--History--Sources.
Duero River Region (Spain and Portugal)--History--Sources.
Feudalism--Spain--History--Sources.
Santa María de Moreruela (Monastery : Zamora, Spain)--History--Sources.