Peck, Lyman C. <br/><br/>
Secret codes, remainder arithmetic, and matrices. 

 - Washington  National Council of Teachers of Mathematics  [1961] 
 - 54 p. 
<br/><br/>Includes bibliography. 
<br/><br/><label>LCCN: </label>61012376  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arithmetic<br/>Ciphers.<br/>Matrices.