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1972 vol. 20, no. 1 vol. 20, no. 2 vol. 20, no. 3 vol. 20, no. 4 vol. 20, no. 5 vol. 20, no. 6

1973 vol. 21, no. 1 vol. 21, no. 2 vol. 21, no. 3 vol. 21, no. 4 vol. 21, no. 5 vol. 21, no. 6

1974 vol. 22, no. 1 vol. 22, no. 2 vol. 22, no. 3 vol. 22, no. 4 vol. 22, no. 5 vol. 22, no. 6

1975 vol. 23, no. 1 vol. 23, no. 2 vol. 23, no. 3 vol. 23, no. 4 vol. 23, no. 5 vol. 23, no. 6

1976 vol. 24, no. 1 vol. 24, no. 4 vol. 24, no. 5 vol. 24, no. 6

1977 vol. 25, no. 1 vol. 25, no. 2 vol. 25, no. 3 vol. 25, no. 4 vol. 25, no. 5 vol. 25, no. 6

1978 vol. 26, no. 1 vol. 26, no. 2 vol. 26, no. 3 vol. 26, no. 4 vol. 26, no. 5 vol. 26, no. 6

1979 vol. 27, no. 1 vol. 27, no. 2 vol. 27, no. 3 vol. 27, no. 4 vol. 27, no. 5 vol. 27, no. 6

1980 vol. 28, no. 1 vol. 28, no. 2 vol. 28, no. 3 vol. 28, no. 4 vol. 28, no. 5 vol. 28, no. 6

1981 vol. 29, no. 1 vol. 29, no. 2 vol. 29, no. 3 vol. 29, no. 4 vol. 29, no. 5 vol. 29, no. 6

1982 vol. 30, no. 1 vol. 30, no. 2 vol. 30, no. 3 vol. 30, no. 4 vol. 30, no. 5 vol. 30, no. 6

1983 vol. 31, no. 1 vol. 31, no. 3 vol. 31, no. 4 vol. 31, no. 5 vol. 31, no. 6

1984 vol. 32, no. 1 vol. 32, no. 2 vol. 32, no. 3 vol. 32, no. 4 vol. 32, no. 5 vol. 32, no. 6

1985 vol. 33, no. 1 vol. 33, no. 2 vol. 33, no. 3 vol. 33, no. 4 vol. 33, no. 5 vol. 33, no. 6

1986 vol. 34, no. 1 vol. 34, no. 2 vol. 34, no. 3 vol. 34, no. 4 vol. 34, no. 5 vol. 34, no. 6

1987 vol. 35, no. 1 vol. 35, no. 2 vol. 35, no. 3 vol. 35, no. 4 vol. 35, no. 5 vol. 35, no. 6

1988 vol. 36, no. 1 vol. 36, no. 2 vol. 36, no. 3 vol. 36, no. 4 vol. 36, no. 5 vol. 36, no. 6

1989 vol. 37, no. 1 vol. 37, no. 2 vol. 37, no. 3 vol. 37, no. 4 vol. 37, no. 5 vol. 37, no. 6

1990 vol. 38, no. 1 vol. 38, no. 2 vol. 38, no. 3 vol. 38, no. 4 vol. 38, no. 5 vol. 38, no. 6

1991 vol. 39, no. 1 vol. 39, no. 2 vol. 39, no. 3 vol. 39, no. 5