A NATIONAL PLAN FOR AMERICAN FORESTRY 



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from 1 million to 1% million family accommodations. These require- 

 ments, along with the effects of a building boom, resulted in a volume 

 of urban residential construction of some 700,000 family units in 



Each dot represents 

 5000 acres 



B 



Each dot represents 

 5000 acres 



FIGURE 2. Maps showing for period of 1919-24 decreases and increases in acreage of all harvested crops: 

 A, decreases; B, increases (based on Census data). 



1928. The abnormal volume of such construction from 1922 to 

 1928 is illustrated in figure 3. 



The effect of this expansion on the use of wood is an interesting 

 study. The small all-wood house apparently uses as much lumber as 

 ever. But the all-wood house is not as common as it once was. There 

 are more materials to choose from. In a six-room house that would 

 require 20,000 feet of lumber, brick veneer may displace 2,800 feet of 

 10-inch siding, or fiber board may displace 3,000 feet of lumber for 



