You mentioned a Albertina GUDERIAN. I have a Albertine Bertha GUDERIAN in my database (b. 23 Sep 1868). Do you believe this is the same person? I believe her parents were Ludwig GUDERIAN and Annie DRESNER. There are many connections between the GUDERIAN, GUMMELT, WITTNER, and PURCZINSKY families. Even though some of these families are parallel lines, I'm still interested in looking at the relationships, because some of the distant cousins and in-laws may have information on the lines I'm directly related, and vice versa.