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found: Data from Great Plains National Instructional Television Library for Checking it out. 118 [VR] 1983 (a.e.) (Ruben Blades; musician)
found: Marton, B.A. Rubén Blades, c1992: CIP t.p. (Rubén Blades) data sheet (Panamanian lawyer and entertainer--singer, songwriter, and actor)
found: The New Grove dictionary of American music (Blades, Rubén (b. Panamá, Panama, 16 July 48). Popular singer and songwriter)