How it works :  the illustrated encyclopedia of science and technology / 
Edited by Ralph Hancock ...[et al.]. 
 - New york :  Marshall Cavendish,  c 1978. 
 - Vols. :  ill. ;  28 cm. 
<br/><br/>V. 12- Mining techniques - pantograph  ; 
<br/><br/>323  323 
<br/><br/><label>ISBN: </label>0-85685-522-7(set) 0-85685-22I-x(v.II) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>encyclopedia of science and technology<br/>encyclopedia 
<br/><br/><label>Dewey Class. No.: </label>503 / I6