Organic materials and soil productivity / 
by W. Flaig ... [et al.]. 
 - Rome :  Food and Agriculture Organization of the United Nations,  1977. 
 - vi, 119 p. :  ill. ;  28 cm. 
 - FAO soils bulletin ;  35 .
 - Soils bulletin ;  35. .
<br/><br/> Bibliography: p. 101-119. 
<br/><br/>Includes bibliographical references (p. 101-119). 
<br/><br/><label>ISBN: </label>9251005109 9789251005101 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Humus.<br/>Organic fertilizers.<br/>Soil fertility.<br/>Soil productivity.