MISSISSIPPI VALLEY, 
Showi 
ing the Stations of the Observers 
of Bird Migration. 
UNDER THE 
IERICAN ORNITHOLOGISTS UNION 
—| 27° 
, 
IN 1884 AND 1885. 
eStations are indicated this: « 
HYPSOMETRIC LEGEND. 
AM 
Ih 
Under 100 feet 
100 to 500 
500 , 1000 
10 
7000 ,, 
bove 2000 ,, 
89° 
91 
41° 
39° 
37° 
» Sutin Brn & Cf ih 
