Construction and operation of cable-chain drag for nest searches / 
by Kenneth F. Higgins ... [et al.] 
 - Washington :  United States Department of the Interior,  1977 
 - 14 p. :  ill. ;  27 cm. 
 - Wildlife leaflet ;  no. 512 .
<br/><br/><label>ISBN: </label> Hadiah 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ducks--Nests<br/>Birds--Nests