(689) Hall, Ralph C. 



1957. Pine reproduction weevil. U.S. Forest Serv. Forest Pest Leafl. 15, 4 pp. 



(690) 



1958. Environmental factors associated with outbreaks of the western pine beetle and 



the California five- spined engraver in California. Tenth Int. Congr. Ento- 

 mol. (Montreal) 1956 Proc. 4: 341-347. 



(691) 



1958. Sanitation -salvage controls bark beetles in southern California recreation area. I 



J. Forest. 56: 9-11. 



(692) Haller, John R. 



1959. Factors affecting the distribution of ponderosa and Jeffrey pines in California. 



MadroiTo 15(3): 65-71. 



(693) 



1961. Some recent observations on ponderosa, Jeffrey and Washoe pines in northeaster! 



California. Madrono 16(4): 126-132. 



(694) 



1962. Variation and hybridization in ponderosa and Jeffrey pines. Univ. Calif. Pub. 



Bot. 34: 123-167. 



(695) Halliday, W. E. D. 



1937. A forest classification for Canada. Can. Dep. Mines & Resources, Forest 

 Serv. Bull. 89, 50 pp. 



(696) Hallin, William E. 



1951. Unit area control in California forests . U.S. Forest Serv. Calif. Forest and 

 Range Exp. Sta. Forest Res. Note 77, 6 pp. 



(697) 

 (698) 

 (699) 

 (700) 

 (701) 



1954. Application of unit area control to ponderosa pine. U.S. Forest Serv . Calif . 

 Forest and Range Exp. Sta. , 4 pp. 



1954. Unit area control- -its development and application. U.S. Forest Serv. Calif. 

 Forest and Range Exp. Sta. Misc. Pap. 16, 10 pp. 



1956. Planting ponderosa pine is a good investment. U.S. Forest Serv. Calif. Forest 

 and Range Exp. Sta. Forest Res. Note 104, 5 pp. 



1956. Pruning ponderosa and Jeffrey pine. U.S. Forest Serv. Calif. Forest and Range 

 Exp. Sta. Forest Res. Note 115, 4 pp. 



(702) 



1957. Silvical characteristics of Jeffrey pine. U.S. Forest Serv. Calif. Forest and 

 Range Exp. Sta. Tech. Pap. 17, 11 pp. (Rev. in Silvics of Forest Trees 

 of the United States (H. A. Fowells, comp.), 1965. U.S. Dep. Agr. For- 

 est Serv. Agr. Handb. 271, pp. 355-359.) 



1959. The application of unit area control in the management of ponderosa -Jeffrey pine 

 at Blacks Mountain Experimental Forest. U.S. Dep. Agr. Tech. Bull. 1191, 

 96 pp. 



(703) Hanover, James W. 



1963. Geographic variation in ponderosa pine leader growth. Forest Sci. 9: 86-95. 



(704) Hansen, Norman J., and A. L. McComb. 



1955. Growth, form and survival of plantation -grown broadleaf and coniferous trees in 

 southeastern Iowa. Iowa Acad. Sci. Proc. 62: 109-124. 



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