FIELD MAP 



413 



Figure 1. — Northwest Corner of the Port Henry, New York, Quadrangle. 



Illustrating method of recording notes. In a full U. S. Geological Survey topographic sheet 

 the numbers would read 7, 17, 27, etcetera, in the right vertical column, and 81, 82, etcetera, to 87 

 below, in the lowest horizontal row. 



