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(1961) Slip-Form Paving as Developed and Pioneered in Iowa,1961. Transportation, Department of
(1961) Feasibility Study of Strengthening Existing Single Span Steel Beam Concrete Deck Bridges, June 1961. Transportation, Department of
(1961) Executive Order No. 5, April 11, 1961. Governor's Office
(1961) Executive Order No. 4, March 30, 1961. Governor's Office
(1961) Executive Order No. 3, March 1, 1961. Governor's Office
(1961) Executive Order No. 1, February 27, 1961. Governor's Office
(1961) Executive Order No. 2, February 27, 1961. Governor's Office
(1961) State of Iowa Transportation Map, 1961. Transportation, Department of
