Hauser, G. F. <br/><br/>
Soil fertility investigations on famers' fields / 
G. F. Hauser. 
 - Rome :  FAO,  1985. 
 - 78 p. :  ill. ;  30 cm. 
 - FAO soils bulletin ;  11 .
<br/><br/> Open access. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soil productivity.