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Douglas, Columbus C., 1812-1874. Higgins, Sylvester W.. Houghton, Douglass, 1809-1845. Hubbard, Bela, 1814-1896. Stone, William James, 1798-1865. Map of Washtenaw County; S. W. Higgins, topographer to Geol. Surv.; C. C. Douglass and Bela Hubbard, assistant geologists.. [JPEG]. Retrieved from https://geo.nyu.edu/catalog/a63153a3-da79-4e6c-9628-b2b40b312377