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		No cover image available Navegaciones colombianas / selec. y pról. de Edmundo O'Gorman. by O'Gorman, Edmundo, 1906-1995 [comp.]. Series: Biblioteca enciclopédica popular. 3a. época ; 209.Material type: Text; Format: print ; Literary form: Not fiction Publication details: México : SEP, 1949Availability: Not available: Coleccion SEP (3).
		No cover image available La protección de la naturaleza : principios y problemas / Enrique Beltrán. by Beltrán, Enrique, 1903-1994. Series: Biblioteca enciclopédica popular ; 206-210Material type: Text; Format: print ; Literary form: Not fiction Publication details: México : SEP, 1949Availability: Not available: Coleccion SEP (1).

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