Richart, Frank E. <br/><br/>
investigation of rigid frame bridges part 1: tests of reinf-orced concrete knee frames and bakelite models / by Frank E-. Richart, Thomas J. Dolan and Tilford A. Olson 

 - Urbana, Illinois : University of Illinois, Engineering Experiment Station 
 - 48 p. 
 - Bulletin ; no.307 .