The full-text of this item is not accessible via OUR Archive. Either the full-text file is not available or it is indefinitely restricted because the author has not granted permission for it to be open access. See Interloan information. If Interloan = yes, you may request this item item via your library Interloans service. ; 194 [1] leaves :ill., maps ; 30 cm. Bibliography: leaf 192-[195] University of Otago department: Mineral Technology.