Clason, Lewis, Pattison, Thomas (Civil Engineer) (1840). 28N 08E - Survey Map of Caledonia and Alcona Townships, Alcona County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_a0fd0e19-2183-4d75-a5a6-b759eaa0a00d (map)