References

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Beaulieu, J. 1996. “Breeding Program and Strategy for White Spruce in Quebec.”
De Montigny, Louise, Suborna Ahmed, Valerie M. LeMay, British Columbia Government EBook Collection, Lands British Columbia. Ministry of Forests, and Natural Resource Operations. 2016. The Effects of Planting Density on the Growth and Yield of Lodgepole Pine, Interior Spruce, Interior Douglas-Fir, and Western Larch: 16- to 26-Year Results from EP964. Vol. 98;98.; Victoria, B.C: Province of British Columbia.
Newton, Peter F. 2003. “Systematic Review of Yield Responses of Four North American Conifers to Forest Tree Improvement Practices.” Forest Ecology and Management 172 (1): 29–51. https://doi.org/https://doi.org/10.1016/S0378-1127(02)00327-4.
Pienaar, Leon V., and Barry D. Shiver. 1984. The Effect of Planting Density on Dominant Height in Unthinned Slash Pine Plantations.” Forest Science 30 (4): 1059–66. https://doi.org/10.1093/forestscience/30.4.1059.
Zobel, Bruce, and John Talbert. 1984. Applied Forest Tree Improvement. New York: Wiley.