370 



TIMBER RESOURCES FOR AMERICA'S FUTURE 



15 



10 



o 

 3 7 



o 6 



o 

 o 



^ 5 



I — 







- A' 



J 



./^ 





ALL PHYSICAL-STRUCTURE A / 

 RAW MATERIALS /\/V / 





^;xY^/ 





>/ 



V 







1 



^ 



_^_/Vv/-V^ A J 



^^/^A^ 



/ V 





vy ^ 



/ 





INDUSTRIAL WOOD ' 



i r 





\ 







V 





f 





NOTE: This chart is plotted on a logarithmic scale. Equal 



vertical distances denote equal percentage change over time. 





7,000 

 6,000 



5,000 

 4,000 



3,000 



2,000 

 1,500 



1,000 s 



900 i 



t— 



800 i 



\— 

 on 



700 ^ 

 600 g 



500 

 400 



300 



200 



1900 



1910 



1920 1930 

 YEARS 



1940 



1950 1955 



H 



Figure 111. — Input of industrial wood and of all the physical-structure materials, 1900-1952. 



