U. S. GEOLOGICAL SURVEY 
129° 127° 125° 123° 121° 119° 117° 115° 113° 111° 109° 107° 1G5° 103° 10l' 
MAP SHOWING CONDITION OF ASTRO 
'■ Areas controlled by triangulation or traverse 
1 * 1 Astronomic station 
YEAF 
