100 



ECHO 



J I I L 



^3.0 

 2.0 



100 r 



TRIPLE ISLAND 



6QL 



3.0 

 2.0 

 1.0 



100 



SCRIPPS PIER 



60 L- 



1920 



1930 



1940 

 YEAR 



1950 



Figure 8. (Continued) 



^L 



1960 



25 



