Osborn, Roger <br/><br/>
Understanding the number system. 
by Roger Osborn 
 - Colombus:  Charles E Merrill publishing company,  1968. 
 - viii,189p.:  22cm. 
<br/><br/>Index. 
<br/><br/><label>Subjects--Index Terms: </label>Algebra, Mathematics 
<br/><br/><label>Dewey Class. No.: </label>512.7