Hansen, Bruce G. <br/><br/>
Serpentine end matching :  a test of visual perception / 
Bruce G. Hansen and Charles J. Gatehell 
 - Broomall :  U.S. Dept. Agriculture,  1978 
 - 5 p. :  figures. ;  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Visual perception<br/>Visiones<br/>Visual perceptiones
<br/><br/><label>Dewey Class. No.: </label>152.1422