McKinnon, Stephen David <br/><br/>
Protection of deep vertical shaft systems 
/ Stephen David McKinnon 
 - [S.l]  Johannesburg  1989 
 - variged pagings 
<br/><br/><label>ISBN: </label>251433 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Michanical engineering<br/> Shaft systems-mathematical models
<br/><br/><label>Dewey Class. No.: </label>621  / MAC