Brink, John (Surveyor), Clark, Robert Jr., Clason, Lewis, Mullett, John, 1786-1862 (1831). 18N 01E - Survey Map of Hay Township, Gladwin County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_9e59335a-8030-4622-ae50-eca518299464 (map)