Figure 13 5 



LESSER SCAUP AND GREEN-WINGED TEAL DAYS OF USE ON POOL 25 



T 



60 ' 62 ' 64 ' 66 

 1959 61 63 65 67 



r 



70 ' 72 ' 74 ' 76 

 69 71 73 75 77 



YEARS 



157 



