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1970 vol. 16, no. 1 vol. 16, no. 2 vol. 16, no. 3 vol. 16, no. 4 vol. 16, no. 5 vol. 16, no. 6

1971 vol. 17, no. 1 vol. 17, no. 2 vol. 17, no. 3 vol. 17, no. 4 vol. 17, no. 5 vol. 17, no. 6

1972 vol. 18, no. 1 vol. 18, no. 2 vol. 18, no. 3 vol. 18, no. 4 vol. 18, no. 5 vol. 18, no. 6

1973 no. 5 no. 6 vol. 19, no. 1 vol. 19, no. 2 vol. 19, no. 3 vol. 19, no. 4

1974 vol. 20, no. 4 vol. 20, no. 5 vol. 20, no. 6