The new encyclopaedia britannica  aalto arithmetic 

 - 15th ed. 
 - Chicago  Helen Hemingway Benton  1981 
 - 1178p.  V.1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopaedia<br/>Encyclopaedia Britannica
<br/><br/><label>Dewey Class. No.: </label>032  / ENC