You can get in touch with Mr. Jurras on the Leverguns.com forums. Just ask for grandcurmudgeon.

Those cartridges pre-dated JDJ's creations if I remember correctly and some were made up for race car drivers and other such "notables" of the time. I remember the article and I also remember that I passed it on to a friend about 8 years ago. He's a packrat (worse than me) so I'll ask if he's still got it. However, it might take MONTHS for him to find it.