オレンジ郡区 (アイオワ州クリントン郡)
↑ Wolfe, Patrick B. (1911). Wolfe's History of Clinton County, Iowa, Volume 1. B. F. Bowen. pp. 318. https://books.google.com/books?id=poQUAAAAYAAJ&pg=PA318#v=onepage&q&f=false