Nelson, Alfred L.  1891- <br/><br/>
Plane trigonometry / 
by Alfred L. Nelson and Karl W. Folley 
 - 3rd ed. 
 - New York :  Harper,  c1956 
 - xi, 134 p. :  ill. ;  24 cm. 
 - Harper's mathematics series .
<br/><br/> "The first two editions of this book were published under the title of Plane and spherical trigonometry." 
<br/><br/>Bound with [Lennes, N. J.] comp. Mathematical tables. New York [1943] 
<br/><br/><label>ISBN: </label> USD 4.00 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plane trigonometry
<br/><br/><label>Dewey Class. No.: </label>514.5