Quarterly bulletin on solar activity.

v.1-3 1932-34; v.4 1934-38; v.5 1939-48; v.6 1949-52; v.7 1953-56; v.8 1957-58; v.9 1959-60; v.10 1961-62; v.11 1963-64; v.12 1965-66; v.13 1967; v.14 1968; v.15 1969; v.16 1970; v.17 1971-72; v.18 1973-74; v.19 1975-76; v.20 1977-78; v.21 1979; v.22 1980; v.23 1981; v.24 1982; v.25 1983; v.26 1984; v.27 1985; v.28 1986; v.29:1 1987; v.29:2 pt.3 1987; v.29:3 pt.4 1987; v.30:1 1988; v.30:3 pt.5 1988; v.31:1 1989; v.31:3 pt.3 1989; v.32:1 1990; v.33:1 1991; v.34:1 1992; v.34:2 pt.4 1992; v.35:2 pt.4 1993; v.35:1 pt.1,2,4 1994; v.36:1-2 pt.1,2,4 1994; v.37:2 pt.1 1995; v.38:1 pt.2,4 1996; v.39:1 pt.2 1997; v.40:1 pt.2 1998; v.41:1 pt.2 1999