A field guide for on-farm experimentation / 
H. J. W. Mutsaers..et al. 
 - Ibadan, Nigeria :  International Institute of Tropical Agiculture,  1997. 
 - xv, 235 p. :  ill., maps ;  25 cm. 
<br/><br/>Includes bibliographical references and indexes. 
<br/><br/> Open. 
<br/><br/><label>ISBN: </label>9781311258 
<br/><br/><label>LCCN: </label>2146599  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture--Research--On-farm.<br/>Agriculture--Research--Africa.--On-farm.