Lean, G. A. <br/><br/>
Spatial ability, visual imagery, and mathematical performance / 
G. A. Lean and M. A. (Ken) Clements. 
 - [Lae] :  Mathematics Education Centre, P.N.G. University of Technology,  1980. 
 - 91p. 
 - Report ;  no. 10. .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Visual perception.<br/>Mathematical ability--Testing.<br/>Space perception.