Orr, Thomas J. 



1942. Reducing pine beetle damage through partial cutting. West Coast Lumberman 

 69(4) : 42-46, illus. 



Salman, K. A., and J. W. Bongberg 



1942. Logging high risk trees to control insects in pine stands of northeastern 

 California. J. Forest. 40(7): 533-539, 



Society of American Foresters 



1954. Forest cover types of North America. Comm. on Forest Types, Soc. Amer. 

 Forest., Wash., D. C. , 67 p. 



Spencer, John S., Jr. 



1953. A study of the ponderosa pine risk rating system. Master's thesis, Univ. 

 Montana, Missoula, 64 p. 



Wickman, Boyd E., and Charles B. Eaton 



1962. The effects of sanitation-salvage cutting on insect-caused mortality at 

 Blacks Mountain Experimental Forest, 1938-1959. U.S. Forest Serv. Tech. 

 Pap. 66, 39 p., illus. 



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