Kerr, Richard M. <br/><br/>
Mule derr habitat guidelines / 
Richard M. Kerr 
 - Washington, D.C. :  United States Government Printing Office,  1979 
 - 62 p. ;  27 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water-supply<br/>Water resources development
<br/><br/><label>Dewey Class. No.: </label>333.91