Burt, William Austin, 1792-1858, Wampler, Joseph, 1783-1842 (1822). 09N 13E - Survey Map of Maple Valley Township, Sanilac County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_132ded5f-1dc1-442a-a87e-dded3d7b996a (map)