1936-45 1946-55 1956-65 1936-65 1936-45 1946-55 1956-65 1936-65 



p/^/| Periodic annual growth, 95-75 percent cutting | Periodic annual depletion 



Periodic annual growth, 75-50 percent cutting 

 Periodic annual growth, 50-50 percent cutting 



Potential annual growth, pine sites 

 Potential annual growth, other sites 



Figure 25. — Periodic annual growth, depletion, and potential annual growth by survey unit. 



53 



