I found this web site for John Von Haden, a professional researcher in Washington Co., Wisconsin: http://www.washcowis.com/ He has family group sheets (with sources referenced) for families who were in Washington County, Wisconsin before 1900 and also families in neighboring counties (Milwaukee, Waukesha, Dodge, Fond du Lac and Ozaukee) and in Germany who had family ties to that part of Wisconsin. I did not find any group sheets for Sasse, Fellwock & Oertwig, but who knows. There could be more on his site that could be helpful. It looks like he does good work, but his prices are high. --Glenn Gohr archives_guy@hotmail.com