Bul. 820, U. S. Dept. of Agriculture. 
PLATE XVI. 
F-64795 
F-64794 
Fic. 2.—INTERIOR VIEW. 
1.—EXTERIOR VIEW. 
Fia. 
DENSE 20-YEAR-OLD STAND OF JACK PINE ON CLAY SOIL IN NEED OF THINNING. 
HUBBARD COUNTY, MINN. 
