Share to Google Classroom A man threads cotton thread onto spools at the Mount Vernon Mill, 1960-62. Courtesy of the South Carolina State Museum. Grades: 3 4 5 6 7 8 9 10 11 12 Subjects: Social StudiesS.C. HistorySouth Carolina - Late 19th CenturyIndustrialization Collection: South Carolina CountiesRichland Series: History of SC Slide CollectionE. Economic Activity in South Carolina | History of SC Slide CollectionI. Textile Mills