BETH, E.W. The foundations of mathematics. A study in the philosophy of science. 2nd rev. ed. 1968. Ocl. -- Id. Formal methods. An introd. to symbolic logic and to the study of effective operations in arithmetic and logic. (1962). Ocl. w. dust-j. (W. stamp "Archief E.W. Beth"). -- Id. Mathematical thought. An introd. to the philosophy of mathematics. (1965). Ocl. w. dust-j. -- Id. Science. A road to wisdom. (1968). Ocl. w. dust-j. (W. stamp "Archief E.W. Beth"). -- And 9 o. (smaller) works by/on B. (13).