1973 - Vol. 1, nos. 1 & 2 August ; no. 3 October ; no. 4 December
1974 - Vol. 1, no. 1 September ; no. 5 April
1975 - Vol. 3, no. 1 January ; no. 2 April ; no. 3 June ; no. 5 December.
1976 - Vol. 4, no. 1 April ; no. 2 October
1977 - Vol. 5, no. 1 April ; no. 2 October
1978 - Vol. 6, nos. 1 & 2
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