Holdings

Date      Vol.        No.
Set 1
1974       8              12
1975       9              2, 3, 5–12
1976       10           complete
1977       11           complete
1978       12           complete
1979       13           complete
1980       14           1–8, [9], 10–12
1981       15           complete
1982       16           1–9, 11–12
1983       17           complete
1984       18           complete
1985       19           complete
1986       20           complete
1987       21           1–6, 8, 9–12
1988       22           1, 4–6, 8, 10
Set 2
1976       10           complete
1977       11           1–5, 8–12
1978       12           1–3, 5, 6, 8, 10–12
1979       13           1–4, 7–12
1980       14           3–8, 10, 11
1981       15           2, 5, [9], 10–12
1982       16           1–9, 12
1983       17           2–6, 8–12
1984       18           1, 2, 7–12
1985       19           1–4, 6, 7, 9–12
1986       20           4–10