Seed, Harry Bolton.
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. .
"A report on research sponsored by the National Science Fou-ndation under Grant No. GK-27770".