Proccedings 

 - Wageningen :  International Working Group on Soilless Culture,  (s.a.) 
 - 185 p.  ; gráfs. 
<br/><br/><label>LCCN: </label>27015 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hidroponía.<br/>Hidroponia--Congresos.
<br/><br/><label>Dewey Class. No.: </label>631.585  / C6 1969