BIRD MIGRATION 



Mississippi Yalley, 



W. W. COOKE and OTTO WIDMANN. 



READ BEFORE THE 



RID G WA T ORNITHOL O Gl CAL CL UB, 



November S, 1SS3. 



; api v 



PUBLISHED IN ^UE "AMERICAN FIELD' 

 Vol. XX, Xo. 22, to Vol. XXI, Xo. 3. 



