Can we make isoglosses?

[Anton]

One strategy might be to start with the rarest feature, which may be writing "mich" for "milch" (?) and see if we can find out where its attestations were written

I dare say we will find nothing. My question on RG about this hangs there for several years already, and the only person who replied was a scholar from Austria who could imagine a case of mistake only. I posted that somewhere in the forum back then.

A scribal mistake it can be, hypothetically, but only if the person writing all those cribbles in You are not allowed to view links. Register or Login to view. could not understand what he writes - that is, if he was blindly copying the stuff.

On the opposite, pox vs box is commonplace, I think it would not allow to pinpoint anything geographically. Other than that, we possess just too little source material for such kind of task.