At New Ulm, in Brown county, are two flourishing potter’s establishments, owned by Messrs. Dauffenbach and Gieseke, and by John Steket (Stoeckert). (The Geological and Natural History Survey of Minnesota, The First Annual Report, For The Year 1872, N. H. Winchell, Press Printing Company, St. Paul, 1873, Page 117)
Fire-bricks. From Cretaceous beds on the Cottonwood river, good fire-bricks have been made by Christian Dauffenbach, by William Winkelmann, and by John Stoeckert, at New Ulm. The characters of the deposits used, and in what proportion, have been stated already in the description of the section in which they occur (page 574). (The Geological and Natural History Survey of Minnesota, 1872-1882, Volume I, N. H. Winchell & Warren Upham, Johnson, Smith & Harrison, Minneapolis, 1884, Page 588)