Note from Josiah Upton, Clinton County Treasurer to ER Knapp , 1870-07-13, Container: Knapp, E.R. - Box 2, Folder: 18 (Knapp Family Property Documents). Families, RG-FAMILIES. Hoyt Library Archives. https://archive.saginawlibrary.org/repositories/2/archival_objects/30087 Accessed December 06, 2025.