Shadbush : References

Bogardus, C. A. (1898). One thousand secrets of rich and wise men revealed. Aurora, IL: C.A. 

Brand, M. H. (2001, January 22). Picea abies. Retrieved from

Brémaud, I. (2011). Acoustical properties of wood in string instruments, soundboards and tuned idiophones: biological and cultural diversity. Acoustical Society of America, 131(1), 807-818.

Characteristics. (2013) United States Department of Agriculture. Retrieved February 2013, from

Earle, C. (2012, November 28). Picea abies. Retrieved from

Hosley, N. W. (1936). Norway spruce in the north-eastern united states: a study of existing plantations. Petersham, MA: Harvard Forest.

Johnson, H., & Grimshaw, J. (2010). The world of trees. Berkeley, CA: University of California Press.   

 Modulus of elasticity. (2010). In Word Net Search (3.1 edition). Retrieved from

Picea abies. (2011, August 16). US Forest Service. Retrieved February 2013, from

Seth, M. K. (2003). Trees and their economic importance. The Botanical Review, 69(4), 321-376.