The man-made world  technology foundation course 
prepared for the Technology Foundation course team by Graham Weaver. 
 - 2nd ed. 
 - Milton Keynes  The Open University Press  1974. 
 - v. : ill. ; 30 cm. 
<br/><br/><label>ISBN: </label>0335025439  unit 24-25 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Technology.<br/>Technology--Social aspects.