| Covers listed |
|
| 1967: | #1 /Vol 1 #1 June, #2 /Vol 1 #2 September, #3 Vol 1 No 3/ December, |
| 1968: | #4 Vol 2 No 1/ June, #5 /Vol 2 #2 September, #6 /Vol 2 #3 December, |
| 1969: | #7 /Vol 2 #4 March, #8 /Vol 3 #1 June, #9 /Vol 3 #2 September, #10 /Vol 3 #3 December, |
| 1970: | #11 /Vol 3 #4 March, #12 /Vol 4, #1 June, #13 /Vol 4 #2 September, #14 /Vol 4 #3 December, |
| 1971: | #15 /Vol 4 #4 March, #16 /Vol 5, #1 December, |
| 1972: | #17 /Vol 5 #2 March, #18 /Vol 5 #3 June, #19 /Vol 5 #4 December, |
| 1973: | #20 /Vol 6 #1 March, #21 /Vol 6 #2 December, |
| 1974: | #22 Vol 6 #3/March, #23 Vol 6 #4/December, |
| 1975: | #24 /Vol 7 #1 September, |
| 1976: | #25 /Vol 7 #2 March, #26 /Vol 7 #3 September, #27 /Vol 7 #4 December, |
| 1977: | #28 /Vol 8 #1 June, #29 /Vol 8 #2 September, #30 /Vol 8 #3 December, |
| 1978: | #31 /Vol 8 #4 June, #32 /Vol 9 #1 September, #33 /Vol 9 #2 December, |
| 1979: | #34 /Vol 9 #3 March, #35 /Vol 9 #4 September, #36 /Vol 10 #1 December, |
| 1980: | #37 /Vol 10 #2 March, #38 /Vol 10 #3 June, #39 /Vol 10 #4 September, #40 /Vol 11 #1 December, |
| 1981: | #41 /Vol 11 #2 March, #42 /Vol 11 #3 June, |
| 1982: | #43 /Vol 11 #4 March, #44 /Vol 12 #1 June, #45 /Vol 12 #2 September, |
| 1983: | #46 /Vol 12 #3 March, #47 /Vol 12 #4 June, #48 /Vol 13 #1 September, |
| 1984: | #49 /Vol 13 #2 March, #50 /Vol 13 #3 June, #51 /Vol 13 #4 October, |
| 1985: | #52 /Vol 14 #1 May, #53 /Vol 14 #2 September, |
| 1986: | #54 /Vol 14 #3 February, #55 /Vol 14 #4 May, #56 /Vol 15 #1 September, #57 /Vol 15 #2 December, |
| 1987: | #58 /Vol 15 #3 April, #59 /Vol 15 #4 August, #60 /Vol 16 #1/2 December, |
| 1988: | #61 /Vol 16 #3 May, #62 /Vol 16 #4 September, |
| 1989: | #63 /Vol 17 #1 April, #64 /Vol 17 #2 September, |
| 1990: | #65 /Vol 17 #3 February, #66 /Vol 17 #4 June, #67 /Vol 18 #1 October, |
| 1991: | #68 /Vol 18 #2 March, #69 /Vol 18 #3 August, #70 /Vol 18 #4 December, |
| 1992: | #71 Vol 19 #1/May, #72 Vol 19 #2/3/December, |
| 1993: | #73 Vol 19 #4/March, #74 Vol 20 #1/July, #75 Vol 20 #2/December, |
| 1994: | #76 Vol 20 #3/April, #77 Vol 20 #4/October, |
| 1995: | #78 /Vol 21 #1/2 February, #79 /Vol 21 #3 July, #80 /Vol 21 #4 December, |
| 1996: | #81 /Vol 22 #1 April, #82 /Vol 22 #2 June, #83 /Vol 22 #3 December, |
| 1997: | #84 /Vol 22 #4 March, #85 /Vol 23 #1 July, #86 /Vol 23 #2 December, |
| 1998: | #87 /Vol 23 #3 March, #88 /Vol 23 #4 July, #89 /Vol 24 #1 December, |
| 1999: | #90 /Vol 24 #2/3 May, #91 /Vol 24 #4 September, #92 /Vol 25 #1 December, |
| 2000: | #93 /Vol 25 #2 April, #94 /Vol 25 #3 July, #95 /Vol 25 #4 September, #96 /Vol 26 #1 December, |
| 2001: | #97 /Vol 26 #2 March, #98 /Vol 26 #3 June, #99 /Vol 26 #4 September, #100 /Vol 27 #1 December, |
| 2002: | #101 /Vol 27 #2 March, #102 /Vol 27 #3 June, #103 /Vol 27 #4 September, #104 /Vol 28 #1 December, |
| 2003: | #105 /Vol 28 #2 March, #106 /Vol 28 #3 June, #107 /Vol 28 #4 September, #108 /Vol 29 #1 December, |
| 2004: | #109 /Vol 29 #2 March, #110 /Vol 29 #3 June, #111 /Vol 29 #4 September, #112 /Vol 30 #1 December, |
| 2005: | #113 /Vol 30 #2 March, #114 /Vol 30 #3 June, #115 /Vol 30 #4 September, #116 /Vol 31 #1 December, |
| 2006: | #117 /Vol 31 #2 March, #118 /Vol 31 #3 June, #119 /Vol 31 #4 September, #120 Vol 32 # 1, |
| 2007: | #121 Vol 32 # 2, #122 Vol 32 # 3, #123 Vol 32 # 4, #124 Vol 33 # 1, |
| 2008: | #125 Vol 33 # 2, #126 Vol 33 # 3, #127 Vol 33 # 4, #128 Vol 34 # 1, |
| 2009: | #129 Vol 34 # 2, #130 Vol 34 # 3, #131 Vol 34 # 4, #132 Vol 35 # 1, |
| 2010: | #133 Vol 35 # 2, #134 Vol 35 # 3, #135 Vol 35 # 4, #136 Vol 36 # 1, |
| 2011: | #137 Vol 36 # 2, #138 Vol 36 # 3, #139 Vol 36 # 4, #140 Vol 37 # 1, |
| 2012: | #141 Vol 37 # 2, #142 Vol 37 # 3, #143 Vol 37 # 4, #144 Vol 38 # 1, |
| 2013: | #145 Vol 38 # 2, Vol 38 # 3Summer, Vol 38 # 4Fall, Vol 39 # 1December, |
| 2014: | Vol 39 # 2March/April/May, Vol 39 # 3Summer, vol 39 # 4Fall, Vol 40 # 1Winter, |
| 2015: | Spring, Summer, Fall, Winter, |
| 2016: | Spring, Summer, Fall, Winter, |
| 2017: | Spring, Summer, Fall, Winter, |
| 2018: | Spring, Summer, Fall, Winter, |
| 2019: | Spring, Summer, Fall, Winter, |
| 2020: | Spring, Vol 45 No 3Summer, Vol 45 No 4Fall, Vol 46 No 1Winter, |
| 2021: | Vol 46 No 2Spring, Vol 46 No 3Summer, Vol 46 No 4Fall, Vol 47 No 1Winter, |
| 2022: | Vol 47 No 2Spring, Vol 47 No 3Summer, Vol 47 No 4Fall, Vol 48 # 1Winter, |
| 2023: | Vol 48 No 2Spring, Vol 48 No 3Summer, Fall, #34 /Winter, |
| 2024: | Spring, Summer, Fall, Winter, |
| 2025: | Spring, Summer, Fall, |
| 2026: | Spring, Summer, |
