Mather, O. R., Pelican Rapids. Clay and brick (buff). (World’s Columbian Exposition 1893 Official Catelog, Part V, Mines and Mining Building, Department E, W. B. Conkey, Chicago, 1893, Page 80)
O. R. Mather, Pelican Rapids…Buff brick. (Eighteenth Annual Report of the United States Geological Survey to the Secretary of the Interior 1896-97, Government Printing Office, Washington, 1897, Page 1116)
The brick works belonging to the estate of O. R. Mather, Pelican Rapids, Minn., was destroyed by fire, causing a loss of $2,000. (Clay Record, Clay Record Publishing Company, Chicago, June 14, 1897, Volume X, Number 11, Page 24)
Fire on the night of June 4 destroyed the sheds and machinery in the brickyard of the O. R. Mather estate at Pelican Rapids, Minn., causing $2,000 loss. (Brick and Clay Record, Windsor & Kenfield Publishing Company, Chicago, IL, Volume VII, Number 7, July 1897, Page 9)
Oliver R. Mather, Pelican Rapids, Minn., will start a brick and tile plant at St. Louis. (The Clay-Worker, T. A. Randall & Co., Indianapolis, Indiana, April 15, 1891, Volume XV, Number 4, Page 414)