| Covers listed |
|
| 1950: | Vol 1 No 1 March, |
| 1954: | May, |
| 1956: | September, |
| 1957: | March, July, October, |
| 1959: | December, |
| 1960: | February, April, June, August, October, December, |
| 1961: | February, April, June, August, October, December, |
| 1962: | January, March, May, July, September, November, |
| 1963: | January, March, May, July, September, November, |
| 1964: | January, March, May, July, September, November, |
| 1965: | January, February, March, April, May, June, July, August, September, October, November, |
| 1966: | January, February, April, May, June, July, August, September, October, November, |
| 1967: | January, February, April, May, June, July, August, September, October, November, |
| 1968: | January, February, April, May, July, August, September, October, November, |
| 1969: | January, March, April, May, July, August, September, October, November, December, |
| 1970: | January, March, April, May, July, August, September, October, November, December, |
| 1971: | January, March, April, July, August, September, October, November, December, |
| 1972: | January, March, April, May, July, August, September, October, November, December, |
| 1973: | January, March, April, May, July, August, September, October, November, December, |
| 1974: | January, March, April, May, July, August, September, October, November, December, |
| 1975: | January, March, April, May, July, August, September, October, November, December, |
| 1976: | January, March, April, May, July, August, September, October, November, December, |
| 1977: | January, March, April, May, June, August, September, October, November, December, |
| 1978: | March, May, July, September, November, |
| 1979: | January, March, April, July, August, September, October, November, December, |
| 1980: | January, March, April, June, August, October, December, |
| 1981: | February, April, June, August, October, December, |
| 1982: | February, April, June, August, October, December, |
| 1983: | February, April, June, August, December, |
| 1984: | February, April, June, August, |
