Whelpley, ThomasA survey map of the islands in the portion of the Kalamazoo River that runs through Otsego Township in Allegan County, Michigan. The survey was completed in 1850.JPEG200004d1a588-0c2f-45e8-9ac1-19a1cf2f0702MI-T001N-R012WengDepartment of Natural Resources8888-003Public01N 12W - Survey Map of Otsego Township, Allegan County, Page 3 [Michigan]MapsMichigan--AlleganT001N-R012W1850