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Some information from was acquired from the International Genealogy Index (IGI) at www.familysearch.com (contributor unknown).
In the early 1990's I briefly became acquainted with Clara Buhr Matthias of Marysville, Snohomish Co., WA. She provided me with some of her research about the early families from Nenndorf and Hohnhorst. Clara was born in Maxfield Township, Bremer County, Iowa (1903) and died in 1997. Her research included 1965 communications from a Oskar Hausbrand from Barsinghausen (possibly a professional researcher) and was handed down to her great nephew Ron Matthias of Waverly, IA . Ron provided me with very large amount of information from her research. Unfortunately most of Clara's research on the early families is unverified.

Maria Agnese Altenburg and Hans Heinrich Gummer had an illegitimate daughter Ilsa Catharina (Altenburg) Gummer who married Johann Heinrich Oltrogge.

If you have come to my website via Ancestry: Several years ago the genealogy giant Ancestry absorbed the genealogy websites of Rootsweb along with personal databases posted at Rootsweb's WorldConnect Project that included a large database of my own family information. I started using Rootsweb in 2000 and they gave us the capability to add, remove, and update our information at anytime and I used these options frequently to post correct and current data. Presently (2006) I am told by Ancestry that we cannot maintain our own databases, we cannot even remove them. If you find information at Ancestry with my name attached please search my website for current information, the databases posted at Ancestry contain inaccurate information. - Karen Rowe.