8 important and rare international volumes on logic: 1) Beth, Formal methods (1962, hardcover); 2) Prior, Formal logic (1962, hardcover); 3) Kreisel-Krivine, Eléments de logique mathématique. Théorie des modèles (1967, hardcover); 4) Copi, Introduction to logic (1964, hardcover); 5) Mendelson, Introduction to mathematical logic, 1972; 6) Stoll, Set theory and logic (1963, hardcover); 7) Lewis, A survey of Symbolic logic. The classic algebra of logic, 1960; 8) Lewis-Langford, Symbolic logic, 1959. All books are in excellent condition; very rare pencil marks appear in only a few volumes. Well-preserved.