WILFORD, B. H. (See Knight, McCambridge, 

 and Wilford, 1956; and Ostmark and Wilford, 

 1956) 



WILSON, A. K. 1958. Log production in Idaho 

 and Montana, 1956. U.S. Forest Serv., 

 Intermountain Forest and Range Expt. Sta. 

 Res. Note 54, 7 pp. 



Includes report on salvage of beetle-killed 

 spruce in Montana and Idaho since 1952. 



WILSON, A. K. 1958. Pulpwood production in 

 Idaho and Montana, 1956. U.S. Forest Serv. , 

 Intermountain Forest and Range Expt. Sta. 

 Res . Note 55, 3 pp. 



Engelmann spruce was an important source of 

 pulpwood production in Idaho but not in Montana. 



WILSON, ALVIN K. (See Miller and Wilson. 

 1959) 



WINTERS', WAYNE STREET. 1954. Reinventory 

 of soil and plant characteristics of Miller 

 Watershed. Master's thesis. Univ. Utah, 

 Salt Lake City. 



Includes quantitative phytosociological data. 



WOOD, STEPHEN L. 1949. The Scolytidae of 

 the Logan Canyon area in Utah and their host 

 plants. Utah Acad. Sci. , Arts and Letters 

 Proc. 26: 127-128. 



Lists 14 species that occur on Engelmann 

 spruce. 



WOOD, STEPHEN L. 1951. Two new species 

 and new genus of Scolytidae (Coleoptera) from 

 Utah. Jour. Kansas Ent. Soc. 24(1): 31-32. 



Reports on Carphoborus engelmanni and Poly- 

 graphus convexifrons on Engelmann spruce. 



WOODWARD, K. W. 1917. Tree growth and 

 climate in the United States. Jour. Forestry 

 15: 521-531. 



WRIGHT, JONATHAN W. 1955. Species cross - 

 ability in spruce in relation to distribution 

 and taxonomy. Forest Sci. 1: 319-349. 



lX W YGANT , N . D . 1958. Engelmann spruce 

 beetle control in Colorado. Tenth Internatl. 

 Cong. Ent. Proc. 1956: 181-184. 



W YGANT, N. D. 1959. Bark beetle control. 

 Jour. Forestry 57: 274-277. 



W YGANT, N. D. , and ARTHUR L. NELSON. 

 1949. Four billion feet of beetle-killed 

 spruce. IN: U.S. Dept. Agr., Trees, Year- 

 book of Agriculture, 1949:417-422. 



W YGANT, N. D. (See Massey, Chisholm, and 

 Wygant, 1953; and Massey and Wygant, 1954) 



YASINSKI, F. M. , and D. A. PIERCE. 1958. 

 Forest insect conditions in Arizona, New 

 Mexico, and west Texas. U.S. Forest Serv. , 

 Rocky Mountain Forest and Range Expt. Sta. 

 Paper 39, 13 pp. 



YEAGER, L. E. 1955. Two woodpecker popu- 

 lation studies in relation to environmental 

 change. Condor 57: 148-153. 



Reports on spruce -fir forests of Colorado. 



YEAGER, L. E. , and L. E. RIORDAN. 1953. 

 Effects of beetle -killed timber on range and 

 wildlife in Colorado. North Amer. Wildlife 

 Conf. Trans., 1953: 596-616. 



YOUNG, L. J. 1911. Reproduction of Engel- 

 mann spruce after fire. Amer. Forestry 17: 

 396-402. 



YOUNG, R. T. 1907. The forest formations of 

 Boulder County, Colorado. Bot. Gaz. 44: 321 - 

 352. 



Community description. 



ZON, RAPHAEL. 1907. Cutting timber on the 

 National Forests and providing for a future 

 supply. U.S. Dept. Agr. Yearbook: 277-288. 



Careful protection from ground fire and light 

 cuttings which do not disturb the forest condi- 

 tions are recommended for Engelmann spruce. 



ZON, R. (See Shantz and Zon. 1924) 



36 



