Aki, Keiiti. Quantitative seismology : theory and methods / Keiiti Aki, Paul G. Richards. - San Francisco : W. H. Freeman, c1980. - 2 v. (xiv, 932, 16 p.) : ill. - A Series of books in geology . ISBN: 0716710587 (v. 1) ; 0716710595 (v.2) LCCN: 91015088 Subjects--Topical Terms: Seismology--Mathematics.