Biswas P. K. <br/><br/>
Useful Letters for All Occasions / 
P. K. Biswas  
 - Calcutta :  Ratan Book Agency;  1979. 
 - 256 p. :  20 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Commercial Correspondece
<br/><br/><label>Dewey Class. No.: </label>651.75  / BIS 1979