[Mexico City: La Internacional, n.d., ca 1970s]. 12mo. Staple-bound pamphlet; printed card wrappers; 23pp. Pages trimmed and bound unevenly (as issued); mild age-toning; Very Good. Spanish-language translations of Mandel's "Revolutionary Marxism and the World Revolution" and Lowy's "Why the IV International?" Issued without date or imprint, but with an advertisement for "La Internacional," the official organ of the Partido Revolucionario de los Trabajadores (PRT), a Mexican Trotskyist party on verso of last leaf of text.