History of northern Wisconsin: containing an account of its settlement, growth, development, and resources, an extensive sketch of its counties, cities, towns and villages, their improvements, industries, manufactories, biographical sketches, portraits of prominent men and early settlers, views of county seats, etc. Chicago: Western Historical Co., 1881. p.1174

Hy Hoeper, foreman of L.J. Mathews' cooper-shop; was born in Hanover, Feb. 28, 1827; came to the United States in 1852; located in Sandusky, Ohio; engaged in farming for a short time, then moved to Buffalo, N.Y., where he learned his trade; was after a time with his brother in Sandusky, Ohio; came to Neenah, Wis., in 1854, engaged in coopering which he has since followed; has been with his present employer about four years. He was married in Neenah in 1857, to Miss Helena Sallamon, of Neenah, born in Germany; they have six children- Henry, August, Nettie, John, Fred, William. Mr. H. is a member of the Lutheran Church and society.