books.google.fr - Looking Into the Earth comprehensively describes the principles and applications of both 'global' and 'exploration' geophysics. Mathematical and physical principles are introduced at an elementary level, and then developed as necessary. Student questions and exercises are included at the end of each...https://books.google.fr/books/about/Looking_Into_the_Earth.html?hl=fr&id=nzJLiPjHvCQC&utm_source=gb-gplus-shareLooking Into the Earth