| Covers listed |
|
| 1975: | Vol 3 # 5November, |
| 1976: | Vol 3 # 9March, Vol 4 # 3September, Vol 4 No 4 October, |
| 1977: | Vol 5 # 3September, Vol 5 # 6December, |
| 1978: | Vol 6 # 4November, |
| 1980: | Vol 8 # 3October, Vol 8 # 4November, Vol 8 # 5December, |
| 1981: | Vol 8 No 8 March, |
| 1985: | #12 /Autumn, |
| 1986: | Vol 14 # 4November, |
| 1987: | November, |
| 1989: | February, March, April, May, December, |
| 1990: | Vol 18 # 2September, |
| 1993: | January, |
| 1994: | February, March, April, May, Summer, September, October, November, December, |
| 1995: | Vol 22 No 6 January, Vol 22 No 7 February/March, Vol 23 No 1 June, Vol 23 No 2 September/October, November/December, December, |
| 1996: | Vol 23 No 4 January/February, March/April, Vol 24 No 3 May/June, |
| 1997: | January/February, July/August, September/October, November/December, |
| 1998: | January/February, March/April, Vol 25 No 6 May/June, September/October, Vol 26 No 3 November/December, |
| 1999: | Vol 26 No 5 March/April, May/June, Vol 27 # 1, |
| 2000: | Vol 27 No 4 January/February, Vol 27 No 5 March/April, Vol 27 No 6 May/June, July/August, Vol 28 No 2 September/October, |
| 2001: | Vol 28 No 4 January/February, March/April, May/June, Vol 29 No 2 September/October, |
| 2002: | January/February, March/April, Vol 30 No 1 July/August, Vol 30 No 3Winter, |
| 2003: | March/April, Vol 30 No 6 May/June, Vol 31 No 1 July/August, September/October, |
| 2004: | January/February, March/April, Vol 31 No 6 May/June, July/August, September/October, November/December, |
| 2005: | January/February, March/April, May/June, Vol 33 No 1 July/August, September/October, November/December, |
| 2006: | Vol 33 No 4 January/February, #v33n5 / March/April, #v33n6 / May/June, Vol 34 No 1-2 July, Vol 34 No 4 , Vol 34 #6, |
| 2007: | Spring, May/June, Vol 35 No 1 July/August, Fall, |
| 2008: | May/June, September/October, November/December, |
| 2009: | January/February, Vol 36 No 6 May/June, July/August, September/October/November/December, |
| 2010: | January/February/March, Vol 37 # 5April/May/June, July/August, September, October, November/December, |
| 2011: | January/February, March/April/May, Vol 38 # 6June/July, Vol 39 # 1/2August/September/October/November, Vol 39 # 3December, |
| 2012: | Vol 39 # 4February, Vol 39 # 5March/April, Vol 39 # 6May/June, Vol 40 # 1July/August, Vol 40 # 2September/October, Vol 40 # 3November/December, |
| 2013: | Vol 40 # 4January/February, Vol 40 #5March-April, Vol 40 #6May/June, Vol 41 #1July/August, Vol 41 #2September/October, Vol 41 #3, |
| 2014: | Vol 41 #4, Vol 41 #5, Vol 41 #6, |
| 2015: | Vol 42 #1, Vol 42 #2, |
| 2016: | Vol 44 #1-2, Vol 44 #3, |
| 2019: | Vol 46 No 4 December, |
| 2022: | Vol 49 No 1 March, Vol 49 No 2 June, |
