Van der Venn R <br/><br/>
Light and plant growth 

 - Holland  N V Philips         1959 
 - 161p, 
<br/><br/> Bibliography 160-161p 
<br/><br/><label>Standard No.: </label>57823 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture
<br/><br/><label>Dewey Class. No.: </label>J:55, J9