File:Photocopy of construction drawing (microfilm copy located at the Iowa Departmant of Transportation, Ames, Iowa). Iowa State Highway Commission, October 1929. SUPERSTRUCTURE HAER IOWA,30-OKOB,1-15.tif
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![File:Photocopy of construction drawing (microfilm copy located at the Iowa Departmant of Transportation, Ames, Iowa). Iowa State Highway Commission, October 1929. SUPERSTRUCTURE HAER IOWA,30-OKOB,1-15.tif](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Photocopy_of_construction_drawing_%28microfilm_copy_located_at_the_Iowa_Departmant_of_Transportation%2C_Ames%2C_Iowa%29._Iowa_State_Highway_Commission%2C_October_1929._SUPERSTRUCTURE_HAER_IOWA%2C30-OKOB%2C1-15.tif/lossy-page1-751px-thumbnail.tif.jpg?20140714094028)
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