Welchons, A. M.  1894-1952. <br/><br/>
Modern trigonometry 
[by] A. M. Welchons, W. R. Krickenberger, and Helen R. Pearson. 
 - Boston,  Ginn and Company  [1962] 
 - 327, 81 p.  illus.  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry.
<br/><br/><label>LC Class. No.: </label>QA531  / .W32 
<br/><br/><label>Dewey Class. No.: </label>514