LITERATURE CITED 



Cox, G. S., R. C. McConnell, and L. M. Mathew 



1960. Ponderosa pine productivity in relation to soil and landforra in western 

 Montana. Soil Sci . Soc. Amer. Proc. 24(2): 139-142. 



Curtis, James D., and Alvin K. Wilson 



1958. A test of group selection in Idaho ponderosa pine. J. Forest. 56(3): 182-189. 



Daubenmire, R. , and Jean B. Daubenmire 



1968. Forest vegetation of eastern Washington and northern Idaho. Wash. Agr. Exp. 

 Sta. Tech. Bull. 60, 104 p., illus. 



Johnson, Philip C. 



1949. Determining the bark beetle hazard of pine stands in northeastern California. 

 J. Forest. 47(4): 277-284, illus. 



Johnson, Philip C. 



1951. Application of risk ratings for western pine beetle control in the Inland 

 Empire. Northwest Sci. 25: 32-37. 



Johnson, Philip C. 



1966. Some causes of natural tree mortality in old-growth ponderosa pine stands in 

 western Montana. U.S. Forest Serv. Res. Note INT-51, 4 p. 



Johnson, Philip C. 



1967. Distribution of bark beetle attacks on ponderosa pine trees in Montana. 

 U.S. Forest Serv. Res. Note INT-62, 7 p., illus. 



Johnson, Philip C. 



1968. Testing si Ivi cultural control of the western pine beetle in the Rocky 

 Mountains. Wash. State Entomol. Soc. Proc. 26: 242-245. 



Keen, F. P. 



1943. Ponderosa pine tree classes redefined. J. Forest. 41(4): 249-253. 



Keen, F. P., and J. Miller 



1960. Biology and control of the western pine beetle. USDA Misc. Pub. 800, 

 381 p . , i llus . 



Keen, F. P., and K. A. Salman 



1942. Progress in pine beetle control through tree selection. J. Forest, 

 40(11) : 854-858. 



Meyer, Walter H. 



1938. Yield of even-aged stands of ponderosa pine. USDA Tech. Bull. 630, 60 p., 

 illus . 



31 



