ACKNOWLEDGMENT 



Many individuals assisted in assembling material for this publica- 

 tion. Special acknowledgment is made to E. V. Roberts, formerly 

 Regional Survey Director, and to W. T. Hicks, who rendered substan- 

 tial assistance in the preparation of the first draft of the manuscript. 

 Field inventory was under the direction of J. W. Cruikshank, N. M. 

 White, and W. E. Houser. Data on inventory, growth, and drain 

 were compiled under the direction of G. F. Morrill, T. C. Evans, and 

 P. R. Wheeler. Unit reports were prepared by E. B. Faulks, A. R. 

 Spillers, and W. T. Hicks. J. W. Girard had principal responsibility 

 for the preparation of volume tables. 



