Modeling :  concepts for using modeling as a research tool / 
Agricultural Research Service 
 - Washington, D.C. :  Agricultural Research Service,  1978 
 - Various pagings ;  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information modeling<br/>Entity-relationship modeling
<br/><br/><label>Dewey Class. No.: </label>006.33