Mullett, John, 1786-1862 (1859). 13N 05E - Survey Map of Frankenlust Township and Portsmouth Township, Bay County and Zilwaukee Township, Saginaw County, Page 1 [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_37bc3022-3517-4f0c-a92f-4ae7db88cca6 (map)