Noise insulation efforts by the Iowa Department of Transportation / Ron Ridnour (Office of Project Planning).Ron. Ridnour1981ZIP
Effects of pavement surface texture on noise and frictional characteristics / Ron Ridnour and Dale Vander Schaaf (Office of Project Planning, Planning and Research Division, Iowa Department of Transportation).Ron Ridnour1987ZIP
Playing with purpose : inside the lives and faith of today's top athletes-- including Tim Tebow, Jeremy Lin, Luke Ridnour, Stephen Curry, Clayton Kershaw, Albert Pujols, Josh Hamilton, Mariano RiveraMike Yorkey2012PDF