Brevoort, Henry Jr.A survey map of St. Helena Island, Moran Township in Mackinac County, Michigan, measured in 1845.JPEG2000df0fd7a1-f44b-4781-9f9f-ebdf87a64a11MI-T040N-R005WengDepartment of Natural Resources8888-003Public40N 05W - Survey Map of St. Helena Island, Moran Township, Mackinac County [Michigan]MapsMichigan--MackinacT040N-R005W1845