Directory of agricultural bibliographic information sources 
/ Comp. S. Keenan, P. J. Wortley 
. - Wageningen  : CTA, 1994
. - X-142p.  : Couv. ill. en coul.  ; 24Cm. 
<br/><br/>Index 
<br/><br/><label>ISBN: </label>9290810963 
<br/><br/><label>Universal Decimal Class. No.: </label>631.