High fidelity.

v.1 1951-1952; v.2 1952-1953; v.7 pt.2; v.8 pt.2; v.25 1975 no.1-6 Jan-Jun; v.25 1975 no.7-12 Jul-Dec; v.26 1976 no.1-6 Jan-Jun; v.26 1976 no.7-12 Jul-Dec; v.27 1977 no.1-6 Jan-Jun; v.27 1977 no.7-12 Jul-Dec; v.28 1978 no.1-6 Jan-Jun; v.28 1978 no.7-12 Jul-Dec; v.29 1979 no.1-6 Jan-Jun; v.29 1979 no.7-12 Jul-Dec; v.30 1980 no.1-6 Jan-Jun; v.30 1980 no.7-12 Jul-Dec; v.31 1981 no.1-6 Jan-Jun; v.31 1981 no.7-12 Jul-Dec; v.32 1982 no.1-6 Jan-Jun; v.32 1982 no.7-12 Jul-Dec; v.33 1983 no.1-6 Jan-Jun; v.33 1983 no.7-12 Jul-Dec; v.34 1984 no.1-6 Jan-Jun; v.34 1984 no.7-12 Jul-Dec; v.35 1985 no.1-6 Jan-Jun; v.35 1985 no.7-11 Jul-Nov; v.35 1985 no.12 Dec; v.36 1986 no.1-6 Jan-Jun; v.36 1986 no.7-12 Jul-Dec; v.37 1987 no.2-11 Feb-Nov; v.37 1987 no.12 Dec; v.38 1988 no.1-12 Jan-Dec; v.39 1989 no.1-7 Jan-Jul