Everyday Applied Geophysics 3: Refraction Seismic Methods covers the physical methods that permit the environmental exploration of the sub-surface in 1, 2, 3 or 4 dimensions (the latter for time-lapse in terms of physical environmental state and geometry). The book specifically addresses the methods feasible, accessible and affordable to all users and provides simple apparatus electronic diagrams, along with Internet open-source and free software links for data interpretation.