Burt, William Austin, 1792-1858, Higgins, Hiram, Hubbard, Bela, 1814-1896 (1845). 51N 38W - Survey Map of Greenland Township, Ontonagon County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_a769b3a6-1cd9-4b80-a0b7-194a50bd9e1e (map)