1. Research in mechanical rock excavation: progress and prospects;Roxborough;R.E.T.C.,1985
2. Developments in tunnelling techniques and equipment in the National Coal Board;Tucker;Min. Engr,1985
3. Significant advance in cutting ability—roadheaders;Morris;R.E.T.C.,1985
4. Roadheaders open new horizons at San Manuel;Douglas;Engng Min. J.,1985
5. Programme of laboratory pilot and full-scale experiments in tunnel boring;O'Reilly,1976