Keywords: Ohio R. canalization 1929 U.S. stamp.1.jpg en The canalization of the Ohio River was commemorated with a 2-cent stamp on October 19 1929 The project's slogan Nine feet Pittsburgh to Cairo indicated the immensity of the work The stamp vignette featues Lock number 5 and dam on the Monongahela River 2014-03-27 00 54 37 Arago people postage the post National Postal Museum online Bureau of Printing and Engraving PD-USGov Uploaded with UploadWizard Stamps of the United States 1921-1930 Dams on stamps |