| Covers listed | |
| 1963: | January, May, August, September, |
| 1975: | January, |
| 1976: | February, April, December, |
| 1977: | November, |
| 1978: | June, |
| 1980: | May, |
| 1984: | February, |
| 1987: | September, |
| 1990: | October, |
| 1991: | February, June, |
| 1992: | January, November, |
| 1993: | January, |
| 1995: | July, |
