Great scientific inventions 

 - New Delhi  Learners Press Private Limited  1997 
 - 193p 
<br/><br/><label>ISBN: </label>9788171814688 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Invention & patents
<br/><br/><label>Dewey Class. No.: </label>608 GRE