Gupta V.K. Au. <br/><br/>
Conservation restoration and philatelic chemistry 
Gupta V.K. Au. 
 - Delhi  Akankaha print services India       1997 
 - 208p  cm. 
<br/><br/><label>Standard No.: </label>10,432 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>G:527, N7