Sondages.

1955:1-2; 1955:4; 1956:1; 1956:3-4; 1957; 1958-59; 1960-61; v.23-24 inc. 1961-1962; 1962-63; v.23 no.3(1961); v.25 1963; v.26 1964; 1964-65; v.27 1965; v.28 1966; 1966-67; v.29 1967; v.30 1968; 1968-69; v.31 1969; v.31,no.1-3 1969; v.32 1970; 1970-71; v.32-33(1970-1971); v.33 1971; 1972; v.34 1972; 1973; v.34-35(1972-1973); v.35 1973; annee 34-36 1972-74; 35-36 annee (1973-74); v.36 1974; 1974-75; v.37 1975; 37-38 annee (1975-76); annee 37-38 1975-76; v.38 1976; 1976-77; v.39 1977; 1978:1-3; v.39:3-4, v.40 1978; v.40,no.1-3 1978