A Guide to models in governmental planning and operations / 
edited by Saul I. Gass and Roger L. Sisson 
 - Potomac Md. :  Sauger Books,  1975 
 - xi, 415 p. :  ill. ;  24 cm. 
<br/><br/> 'Prepared for Office of Research and Development, Environmental Protection Agency ... contract no. 68-01-0788.' 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0915318008 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Policy sciences--Mathematical models