Ferrar, W. L. <br/><br/>
A text-book of convergence, 
by W. L. Ferrar. 
 - Oxford,  The Clarendon Press,  1938. 
 - vi p., 2 l., [3]-192 p.  diagrs.  23 cm. 
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<br/><br/><label>Subjects--Topical Terms: </label><br/>Convergence.<br/>MCE
<br/><br/><label>Dewey Class. No.: </label>515.24  / FER