Burt, William (Surveyor), Burt, William Austin, 1792-1858 (1847). 49N 44W - Survey Map of Carp Lake Township, Ontonagon County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_e82f4647-a4c8-4a66-beb9-d072b089727c (map)