Crawford, Hugh B.Walsh, Oscar B.A survey map of an island in Thunder Bay off the coast of Sanborn Township in Alpena County, Michigan, measured in 1945.JPEG2000aad7220f-e895-4303-86d8-e22805540369MI-T029N-R009EengDepartment of Natural Resources8888-002Public29N 09E - Survey Map of Sanborn Township, Alpena County, Page 3 [Michigan]MapsMichigan--AlpenaT029N-R009E1945