a comparison with that of other parts of the 

 world. U.S. Geol. and Geog. Surv. Bui. 6: 

 1-77. 



GREELEY, WILLIAM B. 1913. Reforestation 

 on the National Forests. Soc. Amer. For- 

 esters Proc. 8: 261-277. 



Engelmann spruce grown in nurseries for re- 

 forestation in Rocky Mountain region. 



GREELEY, W. B. (See Thompson and Greeley. 

 1929) 



GREENHALGH, CLIFTON M. (See Behle, 

 Bushman, and Greenhalgh. 1958) 



GREGORY, HERBERT E. 1916. The Navajo 

 country. A geographic and hydrographic rec- 

 onnaissance of parts of Arizona, New Mexico, 

 and Utah. U.S. Dept. Int., Geol. Surv. Water 

 Supply Paper 380,. 219 pp. 



Discusses distribution of Engelmann spruce 

 and presents climatic data. 



GREGORY, HERBERT E. 1938. The San Juan 

 country. A geographic and geologic recon- 

 naissance of southeastern Utah. U.S. Dept. 

 Int., Geol. Surv. Prof. Paper 188, 123 pp. 



Discusses distribution of and lists species 

 occurring with Engelmann spruce. 



GREGORY, HERBERT E. 1949. Geologic and 

 geographic reconnaissance of eastern Marka- 

 gunt Plateau, Utah. Geol. Soc. Amer. Bui. 

 60: 969-998. 



Discusses distribution of Engelmann spruce. 



GREGORY, HERBERT E. 1950. Geology and 

 geography of the Zion Park Region, Utah and 

 Arizona. U.S. Dept. Int., Geol. Surv. Prof. 

 Paper 220, 200 pp. 



Discusses distribution of Engelmann spruce. 



GREGORY, HERBERT E. 1950. Geology of 

 eastern Iron County, Utah. Utah Geol. and 

 Mineralogical Surv. Bui. 37, 153 pp. Salt 

 Lake City: Univ. Utah. 



Discusses distribution of Engelmann spruce. 



GRIFFITH, B. G. 1931. The natural regenera- 

 tion of spruce in central British Columbia. 

 Forestry Chron. 7(4): 204-219. 



GRIFFITH, B. G. 1940. Spruce regeneration in 

 British Columbia. Forestry Chron. 16: 83-84. 



HAASIS, FERDINAND W. 1928. Germinative 

 energy of lots of coniferous tree seed, as re- 

 lated to incubation temperature and to dura- 

 tion of incubation. Plant Physiol. 3: 365-412. 



HABECK, JAMES R. , and CHARLU M. CHOATE. 

 1963. An analysis of krummholz communities 

 at Logan Pass, Glacier National Park. North- 

 west Sci. 37: 165-166. (Abstract.) 



Succession and community composition. 



HAEUSSLER, G. J. 1952. Insects as destroyers. 

 IN: U.S. Dept. Agr. , Insects, Yearbook of 

 Agriculture, 1952: 141-146. 



Twenty percent of the Engelmann spruce 

 timber in Colorado was destroyed by Engelmann 

 spruce beetle from 1940 to 1946. 



HAHN, GLEN G. (See Hartley, Pierce, and 

 Hahn. 1919) 



HAIG, I. T. (See Supplement, p. 37: Haig, 

 Davis, and Weidmann. 1941) 



HALLIDAY, W. E. D. 1937. A forest classifi- 

 cation for Canada. Canada Dept. int., Forest 

 Serv. Bui. 89. 



Community description. 



HALLIDAY, W. E. D. , and A. W. A. BROWN. 

 1943. The distribution of some important 

 forest trees in Canada. Ecology 24: 353-373. 



Distribution and history of forest trees. 



HANNA, L. A. 1934. The major plant com- 

 munities of the headwater area of the Little 

 Laramie River, Wyoming. Univ. Wyo. Pub. 

 Bot. 1: 243-266. 



Community description. 



HANSEN, H. P. 1938. Ring growth and repro- 

 duction cycle in Picea engelmanni near 

 timberune. Univ. Wyo. Pub. 5: 1-19. 



HANSEN, H. P. 1939. Pollen analysis of a bog 

 near Spokane, Washington. Torrey Bot. Club 

 Bui. 66: 215-220. 



Distribution; discusses forest succession. 



HANSEN, H. P. 1940. Ring growth and domi - 

 nance in a spruce fir association in southern 

 Wyoming. Amer. Midland Nat. 23: 442-447. 



Community description, reproduction, and 

 succession. 



HANSEN, H. P. 1941. A pollen study of post - 

 Pleistocene lake sediments in the Upper 



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