1^ C Y The four-diQit numbers m the column on the left give the lolilude ond longitude of the 

 ■^ ^ ' southeast corner of eoch one degree-quodrongle. Each one-degree quodrangle ii divided 

 into 30-minule quodrongles, numbered at in the diogram to the right. The columns of these tables 

 give: A- minimum temperature, B - moiimum lemperoture, C ' number of yeors, D - number of doys 



DEPTH ZONE 



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