Soil organic matter studies 

 - Vienna  International Atomic Energy Agency  1977 
 - 2 volume :   illustration ;   24 cm. 
 - Proceedings series (International Atomic Energy Agency) .
<br/><br/> English, French, Russian, or Spanish with abstracts in English. 
<br/><br/>Includes bibliographical references. 
<br/><br/><br/>engfrerusspa 
<br/><br/><label>ISBN: </label>9200100775 
<br/><br/><label>LCCN: </label>78-301216 //r853 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Humus--Congresses<br/>Soil productivity--Congresses<br/>Soils--Nitrogen content--Congresses