Strong motion earthquake accelerograms : digitized and plot-ted data : volume 2 corrected accelerograms and integrated -ground velocity and displacement curves, Part B : accelerog-rams IIB021 through IIB040 / California Institute of Techno-logy. 

 - Pasadena, Calif. : Research Laboratory 
 - 291 p. 
 - [Report] ; EERL 72-50 / CALTEC, Earthquake Engineering Rese-arch Laboratory .