Monthly public opinion surveys.

v.1 1955/1956 Incompl.; v.6-7 1961/1962; v.8 1962/1963; v.9 1963/1964; v.10 1964/1965; v.11 1965/1966; v.12 1966/1967; v.13 1967/1968; v.14 1968/1969; v.15 1969/1970; v.16 1970/1971; v.17 1971/1972; v.19 1973/1974; v.20 1974/1975; v.21 1975/1976; v.22 1976/1977; v.23 1977/1978; v.24 1978/1979; v.25 1979/1980; v.26 1980/1981; v.27 1981/1982; v.28 1982/1983; v.29 no.1-11 1983/1984; v.29 no.12-v.30 1984/1985; v.31 1985/1986; v.32 no.1-11 1986/1987; v.32 no.12-v.33 1987/1988; v.34 1988/1989; v.35 1989/1990; v.36; v.37-v.38 no.1; v.38 no.2-12; v.39; v.40 no.1-12 1994; v.40 no.13-v.41; v.42 1996; v.43 1997; v.44-v.45 no.1 1998; v.45 no.2-12 1999; v.46 2000