The delaware river basin :  an environmental assessment of three centuries of quality / 
prepared by The Council on Environmental 
 - Washington, D.C. :  U.S. Government Printing Office,  1975 
 - vi, 87 p. ;  26 cm. 
<br/><br/>Bibliography : p. 84-87 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water quality--Measurement<br/>Water quality bioassay
<br/><br/><label>Dewey Class. No.: </label>628.16837