Preuves.

no.9-10 1951; no.10 1951 Dec; v.2 no.11-16 1952 Jan-Jun; v.2 no.17-22 1952 Jul-Dec; v.3 no.25 1953 Mar; v.4 no.35-40 1954 Jan-Jun; v.4 no.41-46 1954 Jul-Dec; no.47-58 (1955); v.5 1955 Jan-June; v.5 1955 Jul-Dec; no.59-70 (1956); v.6 1956 Jan-Jun; v.6 1956 Jul-Dec; v.7 1957 Jan-Jun; v.7 1957 Jul-Dec; v.8 1958 Jan-Jun; v.8 1958 Jul-Dec; v.9 1959 Jul-Jun; v.9 1959 Jul-Dec; v.10 1960; v.10 1960 Jul-Dec; no.119-130 (1961); v.11 1961; v.12 1962 Jan-Jun; v.12 Jul-Dec 1962; v.13 1963 Jan-Jun; v.13 1963 Jul-Dec; v.14 1964 Jan-Jun; v.14 1964 Jul-Dec; no.167-178 (1965); v.15 1965 Jan-Jun; v.15 Jul-Dec 1965; v.16 1966 Jan-Jun; v.16 1966 Jul-Dec; ann.16 no.179-190 1966; v.17 1967 Jan-Jun; v.17 1967 Jul-Dec; v.18 1968 Jan-May; v.18 1968 Jun-Dec; v.19 1969 Jan-Sept; no.1-4 1970; n.s.1-4 (1970); no.5-8 1971; v.5-8 1971; no.9-12 1972; no.13-16 1973; v.17-20 1974-75; n.s.,no.18-20 1974-1975