Burt, Alvin, Burt, William Austin, 1792-1858 (1839). 26N 16W - Survey Map of Lake, Crystal Lake, and Gilmore Townships, Benzie County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_9b6cdb38-9d4e-4485-961a-0045d7352d0f (map)