TY  - BOOK
AU  - Udias, Agustin
TI  - Principle of  Seismology
SN  - 521624789
U1  - 551.22 
PY  - 1999///
CY  - UK: 
PB  - Cambridge University press, 
KW  - Earth Science
KW  - Elastic waves
KW  - Ray Theory
KW  - Seismology
ER  -