10 
9 
8 nN 
Ke pt’ 
ys i\\ [i 
i: j \ | \ 
S 1p \Vi \ 
— A 1 \ i! 
= 5 iN a 
a \// | 
e / vw NW | 
a | \ 
a A Ly 
Stee Sy. i \ j 
we / ! ye 0 
= 4 Bo / 
3 —________ Pacific Flyway 
___ —.— Central Flyway 
2 
0 
1949 1951 = 1953 1955 1957 1959 1961 = 1963 
YEAR 
FIGURE C-1.--Trends in numbers of wintering ducks, by 
Flyways, 1949-63. 
94 
