Environmental regulation :  law, science, and policy / 
Robert V. Percival...[et all.] 
 - 3rd ed. 
 - Gaithersburg :  Aspen Law & Business,  2000 
 - 1292 p. :  ill.  20 cm. 
<br/><br/><label>ISBN: </label>0735512337  RM289.55 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental law--United States<br/>Environmental law--United States