The leaf mesophylls of twenty crops, their light spectra, and optical and geometrical parameters/ 
H. W. Gausman...[et al.] 
 - Washington :  U.S. G.P.O.,  1973 
 - 59 p. :  ill. ;  24 cm. 
 - Technical Bulletin ;  1465 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Crops
<br/><br/><label>Dewey Class. No.: </label>631.8