Chicago (Ill.). City Map Department1 map : color; 68 x 39 cmScale 1:63,360. ; Shows labor districts and wards.; Depths shown by contours.9967856884202441ark:/81985/n2r49j87kCameron, Amberg Co.PublicMap showing labor districts : established by the rules of the Civil Service CommissionMapsIllinois--Cook County1900sNorthwestern University