Mold, J. <br/><br/>
Counting machines 
J. Mold 
 - Cambridge  Cambridge University press  1974 
 - 32p. 
 - Topics from mathematics .
<br/><br/><label>Subjects--Index Terms: </label>Counting machines 
<br/><br/><label>Universal Decimal Class. No.: </label>681.172  / MOL