16 books • 7 series
Book #1: The Beach Kids and the Lost Lemur! Activity Book
Book #2: The Beach Twins Activity Book
Book #2: Searching For Lost Pirate Treasure Activity Book
Book #4: The Beach Twins and the Search for Lost Gold
Book #36: Geophysical Inverse Theory and Regularization Problems
Book #41: Principles of the Gravitational Method
Book #44: Principles of Electric Methods in Surface and Borehole Geophysics
Book #45: Principles of Electromagnetic Methods in Surface and Borehole Geophysics
