251 
it 
;ed 
îtyra- 
i a 
l be 
the 
insity- 
ilysis, 
:tance 
lerz, 
iter 
stance 
5 and 
5S not. 
Is for 
time, 
rs image 
se of 
ration 
nee 
frame 
the very 
caused 
urbid 
est to 
e in the 
e in 1969, 
lable 
engineer 
or was 
on the 
much 
nd atmos- 
ity to 
s. While 
curve 
e. Two 
ERTS 
a par- 
to be 
Figure 1. ERTS Image of Lake Superior area showinq turbid 
water near Duluth (12 August 1972) Red Rand 
Imagery. This frame also includes the Ely Lake 
area as shown in the blowup.