I hope I'm not beating this to death, but I love a good challenge. Using
Proquest's American journal archive, I generated a list of 140 articles
that were published with Twain as author with a cutoff date of around
1912. I ran that through RefWorks to generate an HTML bibliography which
can be seen at:

http://faculty.quinnipiac.edu/libraries/tballard/twainjournals.html

I hope this is helpful.

Terry Ballard
Quinnipiac University