That should be easy. Eliminate the blacks of africa, the orientals of asia, the indians of south america and you pretty much end up with the celts (Israelites) of europe/america, including the jewish Israelites. Narrows it down quite a bit. --ggg--.
I may have made it sound to exclusive but, you get the drift. That's why I'm interested in the Caucasian mummies found in China. Two-three thousand years later, the descendents of these folks will very likely 'become' members of your Lost Tribes.