decretos 955 de 1970 y 520 de 1971 Colombia creator Gómez Velásquez, Gustavo, [from old catalog] Estrada Vélez, Federico, [from old catalog] Restrepo Cifuentes, Alfonso, [from old catalog] text ck Medellín [Editorial Salesiana 1972] 1972 [1. ed.] monographic spa

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534 p. 22 cm. Gustavo Gómez Velasquez, Federico Estrada Vélez, Alfonso Restrepo Cifuentes. s-ck--- Smuggling Colombia Customs administration Law and legislation Colombia KHH 4825 .A31197 A4 1972 72353900 PUCPR 190128 20190425152337.0 9453915 spa