RAINY RIVER UNIT 



CENTRAL PINE UNIT 



10,000 j 

 8,000 

 6,000- 



4,000- 



2,000- 



1,000 

 800 : 

 600 



400 



200- 



100 

 80 

 60 



40 



OTHER CONIFERS- 

 NONSTOCKED 



OTHER HARDWOODS 



-JACK PINE 



20- WHITE £ RED PINE 



1953 1962 



WESTERN UNIT 



10,000 

 8,000- 

 6,000- 



4,000^ 



2,000- 



1,000- 

 800 



j« 6ooH 



< 400- 



Q 



S 200- 

 o 



i 



i- 



100- 

 80 

 60 



40 

 20 



lOJ-r 



ASPEN-BIRCH- 



-OTHER HARDWOODS 



NONSTOCKED 



JACK PINE 



10,000. 

 8,000- 

 6,000 



4,000' 

 2,000- 



1,000- 



800 

 ffi 600 

 o 

 < 400 



Q 



200 



100 

 80 

 60 



40-1 



20- 



10 



NONSTOCKED 

 OTHER HARDWOODS 



WHITE £ RED PINE 



1953 



1962 



10,000-j 

 8,000l 



6,000 



4,000- 



2,000 



1,000- 



800 : 



iu 600- 



U 



< 400- 



3 200-1 



r 



100- 

 80- 

 60- 



40 



SOUTHEASTERN UNIT 



OAK 



OTHER HARDWOODS 



ASPEN-BIRCH 



NONSTOCKED- 



OTHER CONIFERS- 



WHITE S RED PINE 

 20-1 JACK PINE / 



1953 



1962 





LAKE SUPERIOR UNIT 



10,000-j 







8,000- 







6,000- 







4,000- 







- 





k ^^ AS PEN-BIRCH 



2,000- 



OTHER CONIFERS-^. 



1,000- 

 800^ 





■— . *»^^--- NONSTOCKED 



ui 600- 

 < 400- 



OTHER HARDWOODS^^^ 



THOUSAND 



O 



o 



1 1 





JACK PINE'"'^ 







100- 





*~~- WHITE £ RED PINE 



80- 







60- 







40- 











OAK---^ 



20^ 

 10- 



i —r 



1953 



1962 



10,000 

 8,000- 

 6,000- 



4,000- 



2,000- 



1,000- 

 800 : 



w 600 



o 



< 400- 



200H 



100 

 80 

 60 



40 

 20-1 



10 



MINNESOTA 



ASPEN-BIRCH- 



OAK 



OTHER HARDWOODS \ 



NONSTOCKED 



JACK PINE- 



"WHITE £ RED PINE 



1953 



1962 



1953. 



1962 



Figure 2. — Trends in area by forest cover types be- 

 tween 1953 and 1962. Charts (semi-logarithmic) 

 cover the five Survey Units and the State as a whole. 



October 1964 



V/ 



n [CHAS 



CLARENCE £ /CHASE, 

 Research Fore'srcr" ' 



(Forest Economics) 



/ 



