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All Issues: 1981, Volume 69 and 70
- Volume 69, Number 1: 1 January
- Volume 69, Number 2: 1 February
- Volume 69, Number 3: 1 March
- Volume 69, Number 4: 1 April
- Volume 69, Number 5: 1 May
- Volume 69, Number 6: 1 June
- Volume 69, Number S1: 1 May
- Volume 70, Number 1: 1 July
- Volume 70, Number 2: 1 August
- Volume 70, Number 3: 1 September
- Volume 70, Number 4: 1 October
- Volume 70, Number 5: 1 November
- Volume 70, Number 6: 1 December
- Volume 70, Number S1: 1 November