Station 

 Paper 

 No. 



17 Disintegration of girdled western hemlock and grand fir, 



by Austin E. Helmers. December 1948. 



18 Suggested Montana Douglas-fir Christmas tree standards, 



by S. Blair Hutchison and Ben M. Huey. January 1949. 



19 The possibilities of modifying lightning storms in the 



Northern Rockies, by Vincent J. Schaefer. January 1949. 



20 Forest resources of southern Montana, by W. C. Hodge, 



C. W. Brown and T. L. Finch. May 1949. 



21 Forest resources of Northeast Washington, by Paul D. 



Kemp and H. J. Pissot. May 1949. 



22 Bibliography of ponderosa pine, by A. L. Roe and K. N. 



Boe. March 1950. 



