— 
N N = 
; 
be 
Sy 
  
CONSTRUCTION SOURCES OF GRAVEL, MINTZER 149 
  
Fig. 4. The best available source of suitable gravel is outlined as Site No. 3 in the air- 
photo. The light mottled pattern just to the left of the lake and within the area outlined 
is often indicative of a potential source of gravel, as was found true in this instance.