LITERATURE CITED 



Brown, David B. 



1967. An economic comparison of skidding methods employed in the Northern Rocky 

 Mountain area. Mont. State Univ., Bozeman, Mont., Industrial Eng. Dep., 

 Unpubl. thesis, 133 p. 



Carter, Michael Richard 



1968. The formulation of a technique for finding an "optimal" skidding road 

 layout. Mont. State Univ., Bozeman, Mont., Industrial Eng. Dep., Unpubl. 

 thesis, 86 p. 



Draper, N. R. , and H. Smith 



1966. Applied regression analysis. 407 p. New York: John Wiley and Sons, Inc. 

 Gardner, Rulon B. , and Paul L. Schillings 



1969. Efficiency of three data-gathering methods for study of log-making activi- 

 ties. USDA For. Serv. Res. Note INT-100, 5 p. 



Kato, Seihei 



1966. Studies on the forest road system: preliminary report on the road density. 

 Rep. to the Ministry of Education of Japan, March 1966:215-232. 



Kato, Seihei 



1967. Standard density of the forest road system in the mountain forests of 

 Japan. XIV, lUFRO Congr. , Munchen, Sect. 31-32, Vol. 8:567-581. 



Lussier, L. J. 



1961. Planning and control of logging operations. Quebec, Canada, Laval Univ. 

 For. Res. Found. Contrib. 8, 135 p. 

 Matthews, Donald Maxwell 



1942. Cost control in the logging industry. 374 p. New York rMcGraw- Mil 1 . 

 Schillings, Paul L, 



1969a. Selecting crawler skidders by comparing relative operating costs. USDA 

 For. Serv. Res. Pap. INT-59, 20 p. 

 Schillings, Paul L. 



1969b. A technique for comparing the costs of skidding methods. USDA For. Serv. 

 Res. Pap. INT-60, 23 p. 



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