**I will message back within a day - check your junk folder or text for quickest response: 250-818-4107** Fantastic condition 1965 edition of Interpretation Theory in Applied Geophysics from the International Series in the Earth Sciences by F. S. Grant (Associate Professor of Physics) and G. F. West (Assistant Professor of Physics), University of Toronto. A highly technical textbook written for primarily two audiences, university students at the intermediate level in mathematics or working professionals in Geophysics. Thanks for looking!