Whelpley, ThomasA survey map of the Thunder Bay Islands off the coast of Alpena Township in Alpena County, Michigan, measured in 1854.JPEG2000d871821a-ce5f-4cf1-9a3f-c1c829d9ebc7MI-T031N-R010EengDepartment of Natural Resources8888-003Public31N 10E - Survey Map of Thunder Bay Islands in Alpena Township, Alpena County [Michigan]MapsMichigan--AlpenaT031N-R010E1854