Skinner Silk Mill William Skinner started the Unquomonk Mill in Williamsburg. He came to Holyoke in 1874 after the Mill River flood of that year. Sanborn map analysis: Sanborn 1884 map Sanborn 1889 map Sanborn 1895 map Sanborn 1915 map Sanborn 1949 map – map B Sanborn 1956 map – map B