Real seller with inventory on hand. Trade Paperback. Department of Mines and Technical Surveys, Ottawa, 1965. Very Good. Ex Library Ex-library book with the usual stamps, stickers, etc. Binding is solid and text/interior is clean and free of marking of any kind. Contents Mechanical nature of rocks, Elastic prototypes, Shafts, drifts and tunnels, Pillars, Stopes, caving and susidence, Rock slopes, Foundations, Rock dynamics, with six appendices.