Yates, Robert C.  1904-1963. <br/><br/>
The trisection problem / 
Robert C. Yates. 
 - [Washington, D.C.] :  National Council of Teachers of Mathematics,  1971. 
 - xii, 68 p. :  ill. 
 - Classics in mathematics education;  v. 3 .
<br/><br/> "First published in 1942." 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trisection of angle.