7O SO 70 100 //O /ZO /30 



/SO /60 /7O /#O /<?0 



8000 c. J 



6000 



6 



2.000 



/ooo c. 



70 



Vooo 



3ooo 



^000 



/ooo 



/JO 



Fig. 6. White Oak ; N. Germany ; Sites I-III ; Normal Yield of Main Stand in cubic feet 

 per acre. Also points indicating at what age the average tree attains a diameter of 12", 16", 

 24", and a height of 60 ft., 70 ft., etc. Only wood 3" and over is here considered. 



155 



