| Covers listed |
|
| 1966: | #1 / May, Vol 1 No 2 June, Vol 1 No 3 July, Vol 1 No 4 August, Vol 1 No 5 September, Vol 1 No 6 October, Vol 1 No 7 November, Vol 1 No 8 December, |
| 1967: | Vol 1 No 10 February, Vol 1 No 11 March, Vol 1 No 12 April, Vol 2 No 1 May, August, Vol 2 No 6 October, Vol 2 No 8 November, December, |
| 1968: | Vol 2 No 10 February, Vol 2 No 11 March, Vol 3 No 1May/June, Vol 3 No 2 June/July, Vol 3 No 3 July, Vol 3 No 4 August, Vol 3 No 5 September, Vol 3 No 6 October, Vol 3 No 7 November, Vol 3 No 8 December, |
| 1969: | Vol 3 No 10 February, Vol 3 No 11March, Vol 3 No 12April, Vol 4 No 1 May, Vol 4 No 2June, Vol 4 No 3July, Vol 4 No 4August, Vol 4 No 5September, Vol 4 No 6 October, Vol 4 No 7 November, Vol 4 No 8 December, |
| 1970: | Vol 4 No 9 January, February, March, April, May, June, July, August, September, October, November, December, |
| 1971: | January, February, March, April, May, June, July, August, September, October, Vol 6 No 7 November, Vol 6 No 8 December, |
| 1972: | Vol 6 No 9 January, February, March, April, May, June, July, August, September, October, November, December, |
| 1973: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1974: | January, February, March, April, May, June, July, August, September, October/November, December, |
| 1975: | January, February, March, April, May, July, August, September, October, November, December, |
| 1976: | Vol 10 # 4February, Vol 10 No 6 March, Vol 10 # 7April, Vol 10 # 8May, Vol 10 # 9June, August, September, October, Vol 11 # 1November, December, Vol 11 No 2 December, |
| 1977: | February, March, April, May, June, August, September, October, November, Vol 11 No 12 December, |
| 1978: | Vol 12 # 2February, Vol 12 No 3 March, Vol 12 # 4April/May, Vol 12 # 5June, Vol 12 # 6August, Vol 12 # 7September, Vol 12 # 8October, Vol 12 # 9November, Vol 12 # 10December 78/January 79, |
| 1979: | Vol 12 # 11February, Vol 12 # 12March, Vol 13 # 1April, Vol 13 No 2 May, Vol 13 # 3June/July, Vol 13 # 4August, Vol 13 # 5September, Vol 13 # 6October, Vol 13 # 7November, Vol 13 # 8December 79/January 80, |
| 1980: | Vol 13 # 9February, March, Vol 13 # 10March, April, Vol 13 # 11April, Vol 13 # 12May, Vol 14 # 1June/July, Vol 14 # 2August, Vol 14 # 3September, Vol 14 # 4October, Vol 14 No 5 November, Vol 14 # 6December 80/January 81, |
| 1981: | February, Vol 14 # 7February, Vol 14 # 8March, April, Vol 14 # 9April, Vol 14 # 10May, Vol 14 # 11June/July, Vol 14 # 12August, September, Vol 15 # 1September, Vol 15 # 2October, Vol 15 # 3November, December, Vol 15 # 4December 81/January 82, |
| 1982: | Vol 15 # 5February, Vol 15 # 6March, Vol 15 # 7April, Vol 15 No 8 May, Vol 15 # 9June/July, Vol 15 # 10August, Vol 15 # 11September, Vol 15 # 12October, Vol 16 # 1November, Vol 16 # 2December 82/January 83, |
| 1983: | February, Vol 16 # 3February, Vol 16 # 4March, Vol 16 # 5April, Vol 16 # 6May, Vol 16 # 7June/July, Vol 16 # 8August, Vol 16 # 9September, Vol 16 # 10October, Vol 16 # 11November, Vol 16 # 12December, |
| 1984: | Vol 17 # 1January/February, Vol 17 # 2March, Vol 17 # 3April, Vol 17 # 4May, Vol 17 # 5June/July, Vol 17 # 8August, Vol 17 # 9September, Vol 17 # 10October, Vol 17 No 11 November, Vol 17 # 12December, |
| 1985: | January/February, Vol 18 # 3March, Vol 18 # 4April, Vol 18 # 5May, June/July, Vol 18 # 8August, Vol 18 # 9September, Vol 18 # 10October, November, December, |
| 1986: | January/February, Vol 19 #3March, Vol 19 #4April, May, June/July, Vol 19 #8August, Vol 19 #9September, Vol 19 #10October, Vol 19 #11November, Vol 19 #12December, |
| 1987: | January, February, Vol 20 # 3March, Vol 20 # 4April, Vol 20 # 5May, Vol 20 # 6June, Vol 20 # 7July, Vol 20 # 8August, Vol 20 # 9September, Vol 20 # 10October, November, December, |
| 1988: | January, February, Vol 21 # 3March, April, May, June, July, August, Vol 21 # 9September, October, November, December, |
| 1989: | January, February, March, April, May, June, July, August, Vol 22 # 9September, October, November, December, |
| 1990: | January, February, March, April, May, June, July, August, September, October, November, December, |
| 1991: | January, February, March, April, May, Vol 24 # 6June, July, August, September, October, November, December, |
| 1992: | January/February, March, April, May, Vol 25 # 5June/July, Vol 25 # 6August, September, October, |
