2 Sergio - if You will try to find, what mean, for example, this:
75 272
I will try to confirm Egon's claims with Russian archive sourses.
I guess it may be a location in the "German mapping system" (Planquadratt if Iīm not wrong) Not being a "specialist" in any field I hope someone can confirm this and help to identify the places.
It looks I will have to rewrite Egonīs article and thatīs good. History means learning again and again and even changing concepts and wrong statements.
