The following brick yards were noted in the survey of the county: L. D. Hart, Pine Island, red brick. (A Report on the Geological and Natural History Survey of Minnesota, 1882-1885, The Geology of Minnesota, Volume II, N. H. Winchell and Warren Upham, Pioneer Press Company, St. Paul, Minnesota, 1888, Page 55)
L. T. Irish and Jno. Hart contemplate going into the brick business at Pine Island, Minn. They expect to make 1,000,000 brick this season. (The Clay Worker, T. A. Randall & Co., Indianapolis, March 1899, Volume XXXI, Number 3, Page 288)
At the town of Pine Island the loess is exposed to a depth of 5 or 10 feet over a very large territory. The deposit was worked up to about 6 years ago, and produced a fair quality of red brick, but there is not much local demand for the product. (Clays and Shales of Minnesota, Frank F. Grout and E. K. Soper, The University of Minnesota, Minneapolis, Minnesota, 1914, Page 110)