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(1959) Hydraulics of box culverts, 1959. Transportation, Department of
(1985) Iowa Transportation Laws, HR-234, 1985. Transportation, Department of
(1999) Embankment Quality Phase II Final Report, TR-401, 1999. Transportation, Department of
(2016) A Review of Depth of Cover Tables for Concrete and Corrugated Metal Pipe for the Iowa Department of Transportation TR-703, December 2016. Transportation, Department of
