SHREVE, FORREST. 1942. The vegetation of 

 Arizona. IN: Kearney, T. H. , and Robert H. 

 Peebles, Flowering plants and ferns of Ari- 

 zona. U.S. Dept. Agr. Misc. Pub. 423, pp. 

 10-23. 



Discusses distribution of Engelmann spruce. 



SIMON, C. L. 1961. Effects of lifting date, 

 cold storage , and grading on survival of some 

 coniferous nursery stock. Jour. Forestry 59: 

 449-450. 



SLUSS, ROBERT REGINALD. 1955. A taxonomy 

 of mites found associated with the Engelmann 

 spruce beetle in the Uncompahgre National 

 Forest. Master's thesis . Colo. State Univ. , 

 Fort Collins. 



SMITH, A. D. (See Stoddard and Smith. 1955) 



SMITH, GLENN WILLIAM. 1953. The biology 

 and control of primary bark beetles (Dendroc- 

 tonus) on the Ashley and Wasatch National 

 Forests. Master's thesis. Univ. Utah, Salt 

 Lake City. 



SMITH, J. H. C. (See Goldsmith and Smith. 

 1926) 



SMITH, J. HARRY G. 1950. Silviculture and 

 management of Engelmann spruce in British 

 Columbia, Picea engelmanni (Parry) Englm. 

 Master's thesis . Yale Univ., New Haven, 

 Conn. 



SMITH, J. HARRY G. 1954. A cooperative study 

 of Engelmann spruce -alpine fir. Silviculture 

 and management. Northwest Sci. 28: 157-165. 



SMITH, JOHN HARRY GILBERT. 1955. Some 

 factors affecting reproduction of Engelmann 

 spruce Picea engelmanni Parry and alpine fir 

 Abies lasiocarpa (Hook.) Nutt. Ph.D. thesis. 

 Yale Univ. , New Haven, Conn. 



Requirements for reproduction and factors 

 altered by logging in British Columbia; includes 

 a review of literature . 



SMITH, J. HARRY G. 1956. Some factors af- 

 fecting reproduction of Engelmann spruce and 

 alpine fir. Brit. Columbia Dept. Lands and 

 Forests, Forest Serv. Tech. Pub. T.43,43 pp. 



SMITH, J. H. G. (See DeGrace, Robinson, and 

 Smith, 1952; and Clark, Lehrle, and Smith, 

 1954) 



SMITH, J. H. G. , and M. B. CLARK. 1960. 

 Growth and survival of Engelmann spruce and 

 alpine fir on seed spots at Bolean Lake, B.C. , 

 1954-59. Forestry Chron. 36: 46-49, 51. 



SOCIETY OF AMERICAN FORESTERS. 1948. 

 Forest practices for the inland empire. Jour. 

 Forestry 46: 550-557. 



Lists recommended cutting practices in 

 spruce -fir type; gives community classification. 



SOLHEIM, W. G. (See Rail and Solheim. 1961) 



SOMERS, J. L. 1951. Some properties of the 

 soil of spruce-fir forests in the Snowy Range, 

 Wyoming. Master's thesis. Univ. Wyo., 

 Laramie . 



SPADA, B. 1960. Estimating past diameters of 

 several species in the ponderosa pine sub- 

 region of Oregon and Washington. U.S. 

 Forest Serv., Pacific Northwest Forest and 

 Range Expt. Sta. Res. Note 181, 4 pp. 



Discusses diameters based on relationship 

 between bark thickness and d.o.o. at breast 

 height . 



SPAULDING, PERLEY. 1914. The damping-off 

 of coniferous seedlings. Phytopathology 4: 

 73-87. 



Pythium debaryanum caused damping-off in 

 Engelmann spruce seedlings. 



SPECTOR, WILLIAM S. (Ed.) 1956. Handbook 

 of biological data. 584 pp. Philadelphia and 

 London: W. B.Saunders Co. (Pages 137, 139, 

 141, 144, 147, 185, 336, 338, 452, 505.) 



Provides valuable data on reproducuon, phe- 

 nology, morphology, physiology, and fungal 

 parasites of Engelmann spruce. 



SPENCER, JOHN W. 1915. Management of 

 Engelmann spruce -alpine fir stands. Soc. 

 Amer. Foresters Proc. 10: 192-198. 



SPERRY, OMER E. 1936. A study of growth, 

 transpiration and distribution of the conifers 

 of the Rocky Mountain National Park. Torrey 

 Bot. Club Bui. 63: 75-103. 



SQUILLACE, A. E. 1954. Engelmann spruce 

 seed dispersal into a clearcut area. U.S. 

 Forest Serv. , Intermountain Forest and 

 Range Expt. Sta. Res. Note 11, 4 pp. 



STAHELIN, R. 1941. Thirty-five years of 

 planting on the national forests of Colorado. 

 U.S. Forest Serv. , Rocky Mountain Forest 

 and Range Expt . Sta . , 82 pp . 



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