Blackwell, Peggy J. <br/><br/>
Spatial encounters  exercises in spatial awareness 
director, Peggy J. Blackwell ; illustrator, Paul Lehrer. 
 - Newton, Mass.  WEEA Publishing Center  c1982. 
 - v, 337 p.  ill.  22 x 29 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Space perception.