File:AERIAL VIEW OF LOCK CONSTRUCTION, LOOKING NORTH Photocopy of photograph no. 1458-35, May 6, 1988. Original slide on file at Mississippi River Lock and Dam No. 26R, Alton, HAER ILL,60-ALT.V,1-1 cut.jpg
![File:AERIAL VIEW OF LOCK CONSTRUCTION, LOOKING NORTH Photocopy of photograph no. 1458-35, May 6, 1988. Original slide on file at Mississippi River Lock and Dam No. 26R, Alton, HAER ILL,60-ALT.V,1-1 cut.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e7/AERIAL_VIEW_OF_LOCK_CONSTRUCTION%2C_LOOKING_NORTH_Photocopy_of_photograph_no._1458-35%2C_May_6%2C_1988._Original_slide_on_file_at_Mississippi_River_Lock_and_Dam_No._26R%2C_Alton%2C_HAER_ILL%2C60-ALT.V%2C1-1_cut.jpg/800px-thumbnail.jpg?20180418114917)
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