Proceedings. 

 - Wageningen :  Internactional Working Group ons Soilless Culture,  (s.a.). 
 - 252 p. :  : gráfs. 
<br/><br/><label>LCCN: </label>26813 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hidroponía.<br/>Hidroponia--Congresos.
<br/><br/><label>Dewey Class. No.: </label>631.585  / C6 1973