Environmental effects of surface mineral workings :  report to Department of the Environment / 
prepared by Roy Walter Associates Ltd. 
 - London :  HMSO,  1991. 
 - viii, 176 p. 
<br/><br/><label>ISBN: </label>0117526371 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Strip mining--Great Britain--Environmental aspects.<br/>Environmental protection.