Support of mine workings / 
Department of Trade and Industry. 
 - 2nd ed. 
 - London :  HMSO,  1973. 
 - 13 p. :  ill. 
<br/><br/><label>ISBN: </label>114101647X 
<br/><br/><label>LCCN: </label>91024039 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mining engineering.<br/>Concrete mine supports.