| Covers listed | |
| 1965: | November, |
| 1968: | February, |
| 1969: | June, |
| 1971: | February, |
| 1972: | April, |
| 1973: | July, August, |
| 1975: | February, |
| 1976: | April, October, |
| 1977: | November, |
| 1978: | June, |
| 1982: | July, |
| 1983: | January, February, November, |
| 1984: | January, |
| 1987: | February, Vol 104 No 33 March, |
| 1989: | April, |
| 1990: | September, October, |
| 1991: | July, |
| 1996: | January, August, |
| 1999: | January, |
| 2004: | November, |
| 2005: | March, July, |
| 2009: | December 2009/ January 2010, |
| 2012: | March, |
