Introduction to theoretical seismology: by J. B. Macelwane,S. J. and F. W. Sohon,S. J. Part II,Seismometry, by F. W. Sohon,S. J., Director,Georgetown University Seismological Observatory. ix–149 pages, 15.5 × 23.5 cms. New York,John Wiley and Sons,Inc., 1932. Price $2.75 |