xviii, 364pp. Black and white line illustration of seismic graph frontispiece. Graphs and diagrams throughout. In red cloth-covered boards, blind embossed border, gilt titles on spine. 8vo. <1cm closed tear at head of spine at rear joint. Very minor bumping to spine ends. Dusty and foxed top text block edge. Previous owner's name penned to front free endpaper. Large fold on first few pages. Beautifully neat, clean tight and bright. Dust jacket in two parts and has former owner's label on front, sun-faded spine; shelf wear, several closed tears, minor loss at spine head, chipping.
