(1416) Olson, O. C, J. F. Arnold, and M. A. Coonrod. 



1960. Some tree vigor -soil relationships in the Town Creek plantation. U.S. Forest 

 Serv. Boise Nat. Forest, 8 pp. 



(1417) andD. H. Crockett. 



1963. Relation of two soil substrata conditions to forest cover and nonforested openings 



in the Seven Devils Mountains . Pp. 189-197. IN: Forest-soil Relationships 

 in North America (Chester T. Youngberg, Ed.). Oreg. State Univ. Press. 



(1418) Olson, Robert J., and John P. Nagle. 



1965. Adaptation tests of trees and shrubs for the Intermountain area of the Pacific 

 Northwest. Wash. State Univ. Agr. Exp. Sta. Circ. 450, 43 pp. 



(1419) Oosting, H. J. 



1956. The study of plant communities. Ed. 2. San Francisco: W. H. Freeman & Co. 



(1420) Oregon State Board of Forestry. 



1954. Report of forest insect surveys in Oregon and Washington - season of 1954. 



Oreg. State Board Forest. & U.S. Forest Serv. Pacific Northwest Forest 

 and Range Exp. Sta. , 48 pp. 



(1421) Orr, Howard K. 



1959. Precipitation and streamflow in the Black Hills. U.S. Forest Serv. Rocky 

 Mountain Forest and Range Exp. Sta. , Sta. Pap. 44, 25 pp. 



(1422) Orr, Leslie W. 



1953. Forest insect conditions in the Intermountain Region in 1952. U.S. Dep. Agr. 



Bur. Entomol. & Plant Quar., 12 pp. 



(1423) 



1954. The 1953 pine butterfly outbreak in southern Idaho and plans for its control in 



1954. U.S. Forest Serv. Intermountain Forest and Range Exp. Sta. Misc. 

 Pub. 1, 12 pp. 



(1424) Orr, P. W. 



1964. Important insect outbreaks in Oregon and Washington in 1964. U.S. Forest 



Serv. Reg. 6, 11 pp. 



(1425) and L. F. Pettinger. 



1964. Forest insect conditions in the Pacific Northwest during 1963 . U.S. Forest 



Serv. Reg. 6, 60 pp. 



(1426) , L. F. Pettinger, and R. E. Dolph. 



1965. Forest insect conditions in the Pacific Northwest during 1964. U.S. Forest 



Serv. Reg. 6, 90 pp. 



(1427) , L. F. Pettinger, and R. E. Dolph. 



1966. Forest insect conditions in the Pacific Northwest during 1965. U.S. Forest 



Serv. Reg. 6, 70 pp. 



(1428) Orr, T. J., Jr. 



1945. Selective marking in ponderosa pine on a Klamath Falls tree farm. J. Forest. 

 43: 738-741. 



(1429) Osburn, V. R. 



1962. Field test of Lindane for bark beetle control. Calif. Div. Forest. State Forest. 

 Note 9, 6 pp. 



(1430) Over, William H. 



1932. Flora of South Dakota. Univ. S. Dak. , 161 pp. 



89 



