Dartnall, H. J. A. <br/><br/>
The visual pigments 

 - London  Methuen and  Company Ltd.  1957 
 - vii, 216p.  23cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Visual pigments
<br/><br/><label>LC Class. No.: </label>QP481.D14