Deadlord,
Not sure if you're still looking for it sites with an index but this site has a good index for some of the issues you are looking for (i.e. it does not include 12-75 but has the others)
403 ForbiddenThis site has a complete index up to issue 230 but it is not listed by Issue number, rather by article, so probably not much use.
The DragonDex - A complete index to Dragon MagazineI'll post any others that I come across as well.