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García y García, Antonio. 1976. 'PURCELL, M.: Papal Crusading Policy. The Chief lnstruments of Papal Crusadining Policy and Crusade to the Holy Land from the final loss of Jerusalem to the fall of Acre [1244-1291] (Leiden. E. J. Brill, 1975), x-236 págs.'. ANUARIO DE HISTORIA DEL DERECHO ESPAÑOL. pp. 816-816.
