Twenty-six afternoons of biology  an introductory laboratory manual/ 
George Wald ... et al. 
 - 2nd ed. 
 - Reading, Mass.  Addison-Wesley  1966 
 - xiv, 176 p. :   ill. ;   24 cm. 
<br/><br/><label>ISBN: </label>0201084619 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biology--Laboratory manuals