Longley, William Raymond,  1880-1965. <br/><br/>
Twelve lessons in trigonometry 
[by] Longley and Wilson. 
 - New Haven, Conn.,  Whitlock's book store, inc.  [c1928] 
 - 48 p.  23 cm. 
<br/><br/> Cover title.  At head of title: Yale University, the freshman year. 
<br/><br/><label>LCCN: </label>ca 28000926  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry--Problems, exercises, etc.
<br/><br/><label>LC Class. No.: </label>QA537  / .L6