Duluth North and South Breakwater Lights

TITLE: Opening of Navigation Season.
First Giant Freighters Entering Ship Canal and Duluth-Superior Harbor

CAPTION: The navigation season for Duluth-Superior harbor for Interlake navigation is approximately from April 15th to December 15th or about eight months. This view shows the giant freighters on their first trip of the season to the head of the Great Lakes, as they enter Duluth-Superior harbor.
POSTCARD ID: 142-D and 2B-H1222
PUBLISHER: Zenith Interstate News Co., Duluth, Minn.
Genuine Curteich-Chicago “C.T. Art-Colortone” Post Card (Reg. U.S. Pat Off.)
POSTMARK: None – postcard is unused