Seed, Harry Bolton. <br/><br/>
Site-dependent spectra for earthquake-resistant design / by- H. Bolton Seed, Celso Ugas, John Lysmer. 

 - Berkeley, Calif. : University of California, College of Engineering 
 - 38 p. 
 - Report ; No. UCB / EERC 74-12. .
<br/><br/> "A report on research sponsored by the National Science Fou-ndation under Grant No. GK-27770".