[1908) Struble, George R., and Philip C. Johnson. 

 1955. The mountain pine beetle. U.S. Forest Serv. Forest Pest Leafl. 2, 4 pp. 



[1909) and Philip C. Johnson. 



1964. Black pine-leaf scale. U.S. Forest Serv. Forest Pest Leafl. 91, 6 pp. 



[1910) Stuart, E., Jr., and J. Roeser, Jr. 

 1944. Effect of thinning in the Black Hills . J. Forest. 42: 279-280; discussion, 42: 



608-609. 



[1911) Sudworth, George B. 

 1900. White River Plateau Timber Land Reserve. U.S. Geol. Surv. 20th Annu. Rep. , 



Part V, Forest Reserves, pp. 117-179. 



[1912) 



[1913] 

 [1914) 

 [1915) 



[1925) 



1900. Battlement Mesa Forest Reserve. U.S. Geol. Surv. 20th Annu. Rep., Part V, 

 Forest Reserves, pp. 181-243. 



1908. Forest trees of the Pacific slope. U.S. Dep. Agr., 441 pp. 



1917. The pine trees of the Rocky Mountain Region. U.S. Dep. Agr. Bull. 460, 47 pp, 



1927. Check list of the forest trees of the United States, their names and ranges. 

 U.S. Dep. Agr. Misc. Circ. 92, 295 pp. 



[1916) Sugden, B. A. 

 1964. Annotated list of forest insects of British Columbia Part XII. Boarmiini and 



Melanolophiini (Geometridae) . B.C. Entomol. Soc. Proc. 61: 36-39. 



[1917) Swaine, J. M. 

 1915. Problem of the bark beetle . Can. Forest. J. 11: 89-92. 



[1918) 



1921. Bark beetle combatted. Can. Forest. J. 17: 168. 



[1919) Swanson, Robert H. 



1962. An instrument for detecting sap movement in woody plants . U.S. Forest Serv. 

 Rocky Mountain Forest and Range Exp. Sta., Sta. Pap. 68, 16 pp. 



[1920) Sweeney, James R. , and Harold H. Biswell. 

 1961. Quantitative studies of the removal of litter and duff by fire under controlled 



conditions. Ecology 42: 572-575. 



[1921) Swenk, M. H. 



1911. A new sawfly enemy of the bull pine in Nebraska. Nebr. Agr. Exp. Sta. 24th 

 Annu. Rep., 33 pp. 



[1922) Swenson, W. S. 



1963. Ponderosa pine and Rocky Mountain juniper growth in the Great Plains area of 

 eastern Colorado. J. Forest. 61: 867-868. 



[1923) Tackle, David. 

 1954. Comments on the Baker automatic tree seed planter. J. Forest. 52: 530-531. 



'1924) 



1957. Protection of ponderosa pine cones from cutting by the red squirrel. J. Forest. 

 55: 446-447. 



1959. A further test of tree bands for cone protection. J. Forest. 57: 373. 



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