| Covers listed |
|
| 1967: | #1 /March, #2 /April, Vol 1 No 3 May, #4 Vol 1 # 4/June, Vol 1 No 5 July, August, Vol 1 No 7 September, #8 /October, Vol 1 No 9 November, Vol 1 No 10 December, |
| 1968: | Vol 2 No 1 January, Vol 2 No 2 February, March, April, Vol 2 No 5 May, Vol 2 No 6 June, Vol 2 No 7 July, Vol 2 No 8 August, Vol 2 No 9 September, Vol 2 No 10 October, Vol 2 No 11 November, December, |
| 1969: | Vol 3 No 1 January, Vol 3 No 2 February, March, April, Vol 3 # 5May, Vol 3 No 6 June, July, Vol 3 No 8 August, September, Vol 3 No 10 October, November, Vol 3 No 12 December, |
| 1970: | January, February, March, May, June, July, August, September, November, December, |
| 1971: | January, March, May, June, September, November, December, |
| 1972: | January, February, March, April, May, June, August, September, December, |
| 1973: | February, April, August, December, |
| 1974: | May, October, November, December, |
| 1975: | August, November, December, |
| 1976: | February, March, April, October, November, December, |
| 1977: | January, February, March, April, May, June, October, November, December, |
| 1978: | February, March, June, August, September, December, |
| 1979: | January, March, May, July, September, October, November, December, |
| 1980: | January, February, March, April, June, July, August, September, October, November, |
| 1981: | January, March, April, June, July, August, September, October, November, December, |
| 1982: | January, February, March, April, June, September, December, |
| 1983: | January, February, July, August, Vol 17 No 11 November, December, |
| 1984: | January, April, June, July, August, December, |
| 1985: | February, April, June, October, |
