Pledge, H.T. <br/><br/>
A History of science  H.T. Pledge. 

 - New Delhi  Anmol Publications  1990 
 - 354p., 25cm. 
<br/><br/><label>ISBN: </label>81-7041-380-x. 
<br/><br/><label>Dewey Class. No.: </label>509,  / P62H