Why not do a dig at his supposed grave site, look for bones, and perhaps do a DNA test with a dead/living ancestor??
That's a great idea, James. And if you finance the expedition, locate the unmarked grave somewhere in Mexico, obtain the DNA, and hire the DNA experts to analyze it, I'll cheer you on and publish the results on the Ambrose Bierce Site.
And if you do that...I would be more than happy to be tested...it sounds very interesting to me!!! Greg