TY  - BOOK
AU  - Porcella, R. L.
AU  - Mattiesen, R. B., coaut.
TI  - Preliminary summary of the U. S. Geological Survey strong-m-otion records from the october 15, 1979 Imperial Valley Ear-thquake / R. L. Porcella, R. B. Mattiesen
CY  - Menlo Park, Calif. : United States Geological Survey
ER  -