Twenty years statistics :  k-opium - provincial statistics / 
Government of Bengal. 
 - Calcutta :  Government of Bengal.   1901 
 - 39 p.  18 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Statistics
<br/><br/><label>Dewey Class. No.: </label>315.4  / GOT,1901