books.google.com - The seismic ray method plays an important role in seismology, seismic exploration, and in the interpretation of seismic measurements. Seismic Ray Theory presents the most comprehensive treatment of the method available. Many new concepts that extend the possibilities and increase the method's efficiency...http://books.google.com/books/about/Seismic_Ray_Theory.html?id=Moj_V-8U0tEC&utm_source=gb-gplus-shareSeismic Ray Theory
