Sterling Manufacturing Company Glass Plate Negatives, no date, RHC-VFM-16-16.4a-n, Container: Subseries H; Container: Box 8. Northern Illinois University.
Sterling Manufacturing Company Glass Plate Negatives, no date, RHC-VFM-16-16.4a-n, Container: Subseries H; Container: Box 8. Northern Illinois University. http://archives.lib.niu.edu/repositories/2/resources/821 Accessed July 30, 2025.