Postcard, 4-1/8 x 5-1/2 inches.  "Opened in 1938 at a cost of $5,581,000, Lock and Dam 12 is 110 ft. wide and 600 ft. long. The maximum lift is 9 ft. and it takes 10 minutes to fill or empty the lock chamber. Water takes 8 hours to travel from Lock & Dam 11 at Dubuque, IA to Lock & Dam 12."

Unused. MINT. 

Publisher: VisComm Publishing. 

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