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1970 vol. 39, no. 1 vol. 39, no. 2 vol. 39, no. 3 vol. 40, no. 1 vol. 40, no. 2 vol. 40, no. 3 vol. 41, no. 1 vol. 41, no. 2 vol. 41, no. 3 vol. 42, no. 1 vol. 42, no. 2 vol. 42, no. 3

1971 vol. 43, no. 1 vol. 43, no. 2 vol. 43, no. 3 vol. 44, no. 1 vol. 44, no. 2 vol. 44, no. 3 vol. 45, no. 1 vol. 45, no. 2 vol. 45, no. 3 vol. 46, no. 1 vol. 46, no. 2 vol. 46, no. 3

1972 vol. 47, no. 1 vol. 47, no. 2 vol. 47, no. 3 vol. 47, no. 4 vol. 48, no. 1 vol. 48, no. 2 vol. 48, no. 3 vol. 48, no. 4 vol. 49, no. 1 vol. 49, no. 2 vol. 49, no. 3 vol. 49, no. 4

1973 vol. 50, no. 1 vol. 50, no. 2 vol. 50, no. 3 vol. 50, no. 4 vol. 51, no. 1 vol. 51, no. 2 vol. 51, no. 3 vol. 51, no. 4 vol. 52, no. 1 vol. 52, no. 2 vol. 52, no. 3 vol. 52, no. 4 vol. 53, no. 1 vol. 53, no. 2 vol. 53, no. 3 vol. 53, no. 4

1974 vol. 54, no. 1 vol. 54, no. 2 vol. 54, no. 3 vol. 54, no. 4 vol. 55, no. 1 vol. 55, no. 2 vol. 55, no. 3 vol. 55, no. 4