1/ C Y ^h* four digit numberi m ihe column on lh» left give the latitude ond longitude ol the 

 •^ " ■ southeast corner o( eoch one degree-quodrongle Eoch one-degree quodrongle ii divided 



30-fTnnute quadrangles, numbered oi m the diagram I 

 i: A- minimum temperolure, B- maximum temperature. C- 



right. The colu 

 Tiber of yeors, D - 



I of th«i« tobies 

 mber of doyt 



DEPTH ZONE 



33 



