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Protocol for the accession of the Portuguese Republic and the Kingdom of Spain to the Treaty of Economic, Social and Cultural Collaboration and Collective Self-Defence, signed at Brussels on 17 March 1948, as amended by the "Protocol modifying and completing the Brussels Treaty", signed at Paris on 23 October 1954
gen.	Protocolo de Adesão do Reino de Espanha e da República Portuguesa ao Tratado de Colaboração em Matéria Económica, Social e Cultural e de Legítima Defesa Colectiva