Brooke, Maxey. <br/><br/>
150 puzzles in crypt-arithmetic. 

 - 2d rev. ed. 
 - New York  Dover Publications  [c1969] 
 - 72 p.  22 cm. 
<br/><br/><label>ISBN: </label>0486210391 
<br/><br/><label>LCCN: </label>71010736  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Puzzles.
<br/><br/><label>LC Class. No.: </label>GV1501  / .B7 1969 
<br/><br/><label>Dewey Class. No.: </label>793.7/4