Britain, Calvin Jr.A survey map of an island in Donnell Lake, located in Section 36 of Penn Township in Cass County, Michigan. This map was drawn in May 1985.JPEG20009544b6dd-2419-4093-ad42-721f53449450MI-T006S-R014WengDepartment of Natural Resources8888-003Public06S 14W - Survey Map of Penn Township, Cass County, Page 2 [Michigan]MapsMichigan--CassT006S-R014W1985