(568) Flora, Donald F. 



1965. Economic evaluation of potential European pine shoot moth damage in the pon- 

 derosa pine region. U.S. Forest Serv. Res. Note PNW-22, 14 pp. 



(569) Foiles, Marvin W. 



1961 . Effects of thinning seed spots on growth of three conifers in the Inland Empire, 

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1962. An appraisal of logging damage to advance reproduction of ponderosa pine. U.S. 



Forest Serv. Intermountain Forest and Range Exp. Sta. Res. Note 99, 4 pp. 



(571) and James D. Curtis. 



1965. Natural regeneration of ponderosa pine on scarified group cuttings in central 

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1965. Natural establishment of ponderosa pine in central Idaho. U.S. Forest Serv. 

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(573) Fons, Wallace L. 



1940. Influence of forest cover on wind velocity. J. Forest. 38: 481-486. 



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1946. Analysis of fire spread in light forest fuels. J. Agr. Res. 72: 93-121. 



(575) Forest Genetics Research Foundation. 



1958. Forest genetics research in the Rocky Mountain and Pacific Coast States and 

 British Columbia. 31 pp. 



(576) Forest Genetics Steering Committee. 



1952. A guide for the selection of superior trees in the northern Rocky Mountains. 



U.S. Forest Serv. Northern Rocky Mountain Forest and Range Exp. Sta. 

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(577) Forest Pest Control Action Council. 



1955. Forest insect conditions in California, 1954. Forest Pest Contr. Action Counc. , 

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(578) Foster, Ellery. 



1935. Stand-basal area curves in American yield tables. J. Forest. 33: 57-60. 



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1912. Interrelation between brush and tree growth. Soc. Amer. Forest. Proc . 7: 

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(580) Fowells, H. A. 



1940. Cutworm damage to seedlings in California pine stands. J. Forest. 38: 590-591. 



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1941. The period of seasonal growth of ponderosa pine and associated species. J. For- 

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1943. The effect of certain growth substances on root-pruned ponderosa pine seedlings. 

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1946. Forest tree seed collection zones in California. U.S. Forest Serv. Calif. For- 

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36 



