Cutler, Ann, <br/><br/>
The Trachtenberg speed system of basic mathematics / 
tr. and adapted by Ann Cutler and Rudolph Mcshane 
 - 270 páginas 
<br/><br/><label>Subjects--Personal Names: </label><br/>Trachtenberg, Jakow, 1888- 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aritmética
<br/><br/><label>LC Class. No.: </label>QA115  / C99