SPENCER, Robert <br/><br/>
Report on bird-ringing for 1972 / 
by Robert Spencer and Robert Hudson. 
 -- Hertfordshire :   British Trust for Ornithology,   1974 
 - 64 p. 
<br/><br/> Supl. especial de Bird Study. Vol. 21 (1974) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aves - Informe de anillamiento
<br/><br/><label>Universal Decimal Class. No.: </label>598.2:57.082.13(410)(047)