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(1956) State of Iowa Transportation Map, 1956. Transportation, Department of
(1956) Thin Bonded Concrete Resurfacing U.S. 34 West Burlington, Iowa, HR-34,. Transportation, Department of
(1956) Voting in Iowa by George B. Mather: with illustrations by Dale Ballantyne, February 1956. University of Iowa
(1956) Scour Around Bridge Piers and Abutments, HR-30 and Iowa Highway Research Board Bulletin No. 4, 1956. Transportation, Department of
