BOARD FEET BOARD FEET PER ACRE 
1132 
Journal of Agricultural Research 
Vol. XXXI, No. 1 
40 50 60 70 80 90 100 110 120 130 140 150 160 
TOTAL A6E,YEARS 
Fig. 9.—Mean annual increment per acre, board feet 
Fig. 10 .—Board feet per cubic foot for the entire stand over 8 inches in diameter at breast height 
