Includes quantitative phytosociological data, 

 environmental data, and vegetational change. 



PAUL, B. H. 1961. Choose the right wood. 

 Properties and uses of some minor western 

 softwoods. Woodwkg. Dig. 63(10): 26-27. 



PAUL, B. H. (See Drow, Paul, and Dohr. 1955) 



PEARCE, W. J. 1939. Growth in cutover stands 

 in the Engelmann spruce type. Jour. For- 

 estry 37: 977. 



PEARSON, G. A. 1913. What is the proper 

 basis for the classification of forest land into 

 types? Soc. Amer. Foresters Proc. 8: 79-84. 



Distribution of Engelmann spruce. 



PEARSON, G. A. 1920. Factors controlling 

 the distribution of forest types, Part I. 

 Ecology 1: 139-154. 



Climatic, edaphic, and topographic factors. 



PEARSON, G. A. 1920. Factors controlling 

 the distribution of forest types, Part II. 

 Ecology 1: 289-308. 



Includes climatic data and autecology of 

 Engelmann spruce. 



PEARSON, G. A. 1924. Studies in transpiration 

 of coniferous tree seedlings. Ecology 5: 340- 

 347. 



PEARSON, G. A. 1928. Measurement of physi- 

 cal factors in silviculture. Ecology 9: 404- 

 411. 



Discusses temperature data and reproduction 

 of Engelmann spruce. 



PEARSON, G. A. 1931. Forest types in the 

 southwest as determined by climate and soil. 

 U.S. Dept. Agr. Tech. Bui. 247, 144 pp. 



PEARSON, G. A., and R. E. MARCH. 1935. 

 Timber growing and logging practice in the 

 southwest and in the Black Hills region. U.S. 

 Dept. Agr. Tech. Bui. 480, 80 pp. 



PEATTIE, D. C. 1953. A natural history of 

 western trees. Boston: Houghton -Mifflin Co. 



Includes general information on Engelmann 

 spruce. 



PEFFER, E. F. (See Pissot and Peffer. 1948) 

 PEGG, GEORGE. (See Moss and Pegg. 1963) 



PENHALLOW, D. P. 1904. The anatomy of the 

 North American coniferales together with 

 certain exotic species from Japan and Aus- 

 tralia. Amer. Nat. 38: 243-273, 331-359, 

 523-554, 691-723. 



Characteristics of wood anatomy of Engel- 

 mann spruce are given in a table on page 714. 



PENHALLOW, D. P. 1907. A manual of the 

 North American gymnosperms. 374 pp. 

 Boston: Ginn and Company. 



Discusses wood anatomy and distribution of 

 Engelmann spruce. 



PETERSON, G. 1961. Board -foot volumes of 

 Engelmann spruce to an 8 -inch top. U.S. 

 Forest Serv., Rocky Mountain Forest and 

 Range Expt. Sta. Res. Note 56, 2 pp. 



Arizona and New Mexico . 



PETERSON, ROGER S. 1961. Notes on western 

 rust fungi. I. Chrysomyxa. Mycologia 53: 

 427-431. 



Discusses Chrysomyxa arctostaphyli Diet, on 

 Engelmann spruce. 



PETERSON, ROGER S. 1963. Effects of broom 

 rusts on spruce and fir. U.S. Forest Serv. , 

 Res. Paper INT-7, 10 pp. 



PFLUGBEIL, ERNST. 1960. Proposed site in- 

 dices for Engelmann spruce on the College 

 Forest of the U. S. U., Logan. Master's 

 thesis. Utah State Univ . , Logan. 



PIERCE, D. A. (See Yasinski and Pierce. 1958) 



PIERCE, ROY G. (See Hartley and Pierce, 1917; 

 and Hartley, Pierce, and Hahn, 1919) 



PIERSON, R. K. , and JOHN EHRLICH. 1937. 

 Effects of the autumn 1935 cold wave on forest 

 trees in northern Idaho. Plant Dis. Rptr. 21: 

 64-65. 



Engelmann spruce suffered considerable 

 browning and premature needle cast. 



PISSOT, HENRY J. , and E. F. PEFFER. 1948. 

 Forest resource statistics Cascade County, 

 Montana. U.S. Forest Serv., North. Rocky 

 Mountain Forest and Range Expt. Sta. Paper 

 12, 22 pp. 



PLUMMER, FRED G. 1900. Mount Rainier 

 Forest Reserve, Washington. U.S. Geol. 



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