Environmental pollution and conservation  [videorecording] 

 - 1 videocassette (VHS) (10 min.)  sd., col., ;  1/2 in. 
<br/><br/> Copy available in DVD format 
<br/><br/>Speakers: Charles Brady 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pollution--Environmental aspects--Conservation.<br/>Pollution--Conservation.