Johnson, Donovan A. <br/><br/>
Exploring mathematics on your own :    understanding numeration syst ems /  
by Donovan A. Johnson and William H. Glenn. 
 - London :    John Murray,    1961. 
 - 303 p. :    ill. ;    24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Numerals.<br/> Mathematical recreations.
<br/><br/><label>Dewey Class. No.: </label>510 JOH