Real maths /  
S. Stephen Willoughby...[et al.]. 
 - Illinois :    Open Court, La Salle,    1981. 
 - 408 p. :    ill., (some col.). ;    28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Mathematics.
<br/><br/><label>Dewey Class. No.: </label>510