Irala, Narciso <br/><br/>
Mental efficiency :  without fatigue / 
by Narciso Irala 
 - Allahabad :  Saint Paul Society,  1975 
 - 150 p. :  ill. ;  19 cm. 
 - Mind and work series ;  no 12 .
<br/><br/><label>ISBN: </label> Rs. 4.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental efficiency<br/>Conduct of life
<br/><br/><label>Dewey Class. No.: </label>131.3