21 chain and washer pumps :  from the 1958 Peking Agricultural exhibition / 
compiled by Simon Watt. 
 - London :  Intermediate Technology Publictions Ltd,  1976. 
 - 49 p. :  ill. ;  22 cm. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>0903031264 
<br/><br/><label>LCCN: </label>77369415  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pumping machinery--Exhibitions.<br/>Agricultural exhibition, Peking, 1958.