
| 2021 | ||
| Summer (July) | ||
| 2020 | ||
| March | December | |
| 2019 | ||
| March | ||
| 2018 | ||
| April | September | |
| 2017 | ||
| August | September (Eclipse Edition) | |
| 2016 | ||
| June | ||
| 2014 | ||
| March | ||
| 2013 | ||
| October | ||
| 2011 | ||
| Winter (January) | Spring (March) | Summer (July) |
| 2010 | ||
| Spring | Spring (May, Lunar Occultation Edition) | Summer (August) |
| 2009 | ||
| Spring | Fall | Winter |
| December | ||
| 2008 | ||
| Fall | Late Fall | |
| 2007 | ||
| Spring | ||
| 2006 | ||
| Spring | Fall | |
| 2005 | ||
| Spring | ||
| 2003 | ||
| Fall | ||
| 2002 | ||
| Issue 1 | Issue 2 (PDF unavailable) | |
| 1999 | ||
| Issue 5 | ||
| 1998 | ||
| Issue 1 | Issue 2 | |
| 1997 | ||
| Issue 1 | Issue 2 | Issue 4 |
| Issue 5 | Issue 6 | |
| 1996 | ||
| Issue 1 | Issue 2 | Issue 3 |
| Issue 4 | ||
| 1995 | ||
| Issue 1 | Issue 2 | Issue 3 |
| Issue 4 | Issue 5 | |
| 1994 | ||
| Issue 1 | Issue 2 | Issue 3 |
| Issue 4 | Issue 5 | |
| 1993 | ||
| Issue 2 | Issue 3 | Issue 4 |
| 1992 | ||
| Issue 1 | Issue 2 | Issue 3 |
| Issue 4 | ||
| 1991 | ||
| Spring | Late Summer | Fall |
| Winter | ||
| 1990 | ||
| Summer | Fall | |
