Todd John <br/><br/>
Table of aretangents of rational numbers 

 -  1951 
 - p.  cm. 
 - National Bureau of Standard applied Mathematics Series; 11 .
<br/><br/><label>Standard No.: </label>24132 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B5e, J1