Earth waves. Leet, L. Don (Lewis Don), 1901-1974. Seismometry. Elastic waves. QE539 .L38 551.22 LEE "Much of the material was assembled ... for presentation as a course of eight lectures on 'Applications of seismological techniques to engineering problems' for the Lowell Institute of Boston in the autumn of 1946." Cambridge, Harvard University Press, 1950. 1950. 1950 Text 122 p. eng Harvard monographs in applied science ; no. 2 Lowell Institute lectures ; 1946. Harvard monographs in applied science ; no. 2.