Phyton.

v.1-6; v.2 no.1 1952; v.1-3 1951-1953; v.3 no.1 1953; v.4 no.1-2 1953; v.1-5 1951-1955; v.1-5(1951-1955); v.5 no.1 1955; v.5-8 1955-1957; v.6-10(1956-1958); v.6-8 1956-57; v.6-10 1956-1958; v.7-9; v.7-11 1956-58; v.9-11 1957-1958; v.9-12 1957-59; v.10-11; v.11-15(1958-1960); v.11-15 1958-1960; v.12-14 1959-1960; v.12-15 1959-60; v.12 no.1; v.13-17 1959-61; v.13 no.1; v.13 no.2; v.14-15; v.16-18; v.16-19(1961-1962); v.16-20 1961-1963; v.18-20 1962-63; v.19-21; v.20-23(1963-1966); v.21-23 1964-66; v.22-23; v.24-27(1967-1970); v.24-25; v.24 no.2 1967; v.21-25 1964-1968; v.26-27; v.26-27 1969-1970; v.25-28 1968-71; v.28-29; v.28-30 1971-1972; v.28-31(1971-1973); v.29-30 1972-74; v.30 no.1-2; v.31-33 1973-1975; v.31 no.2; v.32-33; v.32-34(1974-1976); v.33-35 1975-77; v.33-35 1975-1977; v.34-36; v.34-36 1976-1978; v.36-38 1978-80; v.37-38; v.37-38 1979-1980; v.35-38(1977-1980); v.39-40; v.39-41(1980-1981); v.40-41 1981; v.41-43; v.42 1982; v.42-43 1982-83; v.43 no.1 1983; v.44-46; v.44 no.1 1984; v.42-45(1982-1985); v.45 1985; v.46 1986; v.46-47 1986-87; v.46-49(1986-1989); v.48-49; v.48 no.1-2; v.49-51; v.50-51 1989-90; v.51-52 1990-1991; v.50-52(1989-1991); v.52-53 1991-1992; v.52 no.1; v.52 no.2; v.53-54(1992-1993); v.54-55 1992-1994; v.56-57 1994-1995; v.55-57(1994-1995); v.58-59 1996; v.60-61 1997; v.62 1998