I've just read your message, I'm also looking for my Beermann - Biermann ancestors. I have made a website and I happen to be from the same area you are talking from. My family branch is originally from Glashof and goes later into Schessinghausen, which is very close to it.
I'm of German origins, both of my parents are german, but I have lived 29 years in Andorra and have become Andorran citizen. Since 1999 I live in France with my French husband.