Lancy, David F. <br/><br/>
Intra-cultural variation in cognitive development :  conservation of length among the Imbonggu / 
David F. Lancy, Randall J. Souviney, Venina Kada. 
 - [Port Moresby] :  Indigenous Mathematics Project,  1981. 
 - 20 leaves. 
 - Working paper ;  15. .
 - Working paper (Indigenous Mathematics Project) ;  15. .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cognition and culture--Papua New Guinea--Ialibu Region.<br/>Imbonggu (Papua New Guinea people).