1558) Pitkin, Franklin H. 



1961. Combination cone kiln and extractor. U.S. Forest Serv. Tree Planters' Notes 

 48: 25-27. 



1559) Poli, Adon, and Harold L. Baker. 



1953. Ownership and use of forest land in the Coast range pine subregion of California. 

 U.S. Forest Serv. Calif. Forest and Range Exp. Sta. Tech. Pap. 2, 64 pp. 



1560) Pope, Robert B. , and John F. Wear. 



1961 . Results of study to test the accuracy of large-scale vertical and oblique photo- 



graphs for the appraisal of ponderosa pine mortality (Lost Valley Study). 

 U.S. Forest Serv. Pacific Northwest Forest and Range Exp. Sta. , 20 pp. 



1561) Potter, Loren D. 



1952. North Dakota's heritage of pine. N. Dak. History 19(3): 1-11. 



1562) and Duane L. Green. 



1964. Ecology of ponderosa pine in western North Dakota. Ecology 45: 10-23. 



1563) Poulsen, William G. 



1964. Weed control in Utah conifer tree plantings. Utah Farm & Home Sci. 25(1): 



22-23. 



1564) 



1965. Simazine weed control. U.S. Forest Serv. Tree Planters' Notes 73: 1-2. 



1565) Pratt, M. B. 



1907. Marking in western yellow pine forest. Forest. & Irrig. 13: 656-658. 



1566) 



1911. Results of "light burning" near Nevada City, California. Forest. Quart. 9: 

 420-422. 



1567) Preston, John F. 



1925. Control of bark beetles on the national forests . J. Forest. 23: 49-61. 



1568) Price, Jay H. 



1924. Relation of the quality of lumber produced to the percentage of the stand cut. 

 J. Forest. 22: 894-901. 



1569) Price, Raymond. 



1956. Possibilities of increasing and maintaining production from grass and forest 



lands without accelerating erosion. Pp. 233-244. IN: The Future of Arid 

 Lands (Gilbert F. White, Ed.). Amer. Assoc. Advance. Sci., Wash., D.C. 



1570) 



1962. Progress in the integration of forestry and grazing--the United States and Canada. 



Fifth World Forest. Congr. (Seattle) Proc. 1: 329-337. 



1571) and M. D. Hoover. 



1957. Watershed management research in Arizona conducted by the Forest Service. 



Ariz. State Land Dep., Ariz. Watershed Program Proc. 1: 5-10. 



1572) Prior, K. W., R. W. Washbourn, and B. M. Priest. 



1963. Afforestation in the Otago Land District. N. Zeal. J. Forest. 8: 707-727. 



1573) Putnam, R. W., and P. V. Ingram. 



1926. Porcupine damage to western yellow pine. Timberman 27(6): 190. 



97 



