Seventh progress report of the highway bridge impact invest-igation 

 - Urbana, Illinois : University of Illinois, Engineering Experiment Station 
 - [43]p. 
<br/><br/> Contenido: Summary of activities. part A. -- A preliminary -study of the effects of roadway unevenness on the dynamic r-esponse of simple span highway bridges. part B. / by J. Tol-edo. -- Progress report on a test program involving a highw-ay bridge model. part C -- by J. Prince