Brookfield, Noah, Mullett, John, 1786-1862, Sibley, Sylvester (1838). 19N 18W - Survey Map of Hamlin Township, Mason County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_f8360f6d-eebb-4b22-907d-24c9ed01239e (map)