“Emory Alexander Ellsworth”. Journal of the Boston Society of Civil EngineersIII (8): 480. (October 1916). https://books.google.com/books?id=KhdbAAAAYAAJ&pg=PA480. "In 1879 Mr. Ellsworth left the firm of Davis & Ellsworth to become principal assistant and head draftsman for D. H. & A. B. Tower, of Holyoke, who were the largest firm of paper mill architects in the country at that time, and who designed no less than twenty paper mills in the city of Holyoke alone"
