IS:con- 
graphs 
10dern 
reting 
cimate 
ossible 
e posts 
flected 
Figure 
nagni- 
ry with 
. (about 
lasted 
r rims 
k dots 
1g Cir- 
enches 
earth 
t even 
e grey 
alized 
rere it 
ds are 
Espe- 
  
  
  
  
  
  
  
  
  
  
   
  
     
  
  
  
  
  
  
  
  
  
   
  
  
   
  
  
  
  
Frc. 12. Vertical of a strong point in sandy ground, showing trenches, bunkers, 
emplacements and machine-gun nests. 
  
Fic. 13. The same photo as above with symbols.