Hello, I just have been viewing posts to Winona County and found your old post. There is much information on the Schumann family in Winona and surrounding area. The most significant would be concerning Adolf Schumann, who found a huge Native American Cache of ancient Paleo Indian artifacts on his farm (flints/arrows) this collection is currently house at the Olmsted County History Center in Rochester, MN. Hope this information leads to more information for your family! As an aside, my husband and I are close friends of one of the Schumann's from this area and I am a former employee of the History Center. You can google the Schumann Cache and find much information - Good luck!