Preface; Preface to Computer Materials; 1. Approaching the subsurface; 2. Seismic exploration: fundamental considerations; 3. Seismic exploration: the refraction method; 4. Seismic exploration: the reflection method; 5. Electrical resistivity; 6. Exploration using gravity; 7. Exploration using the magnetic method; 8. Electromagnetic surveying; Appendixes; Index.