Aitken lab alumn Amanda R. De La Torre has a paper out on her PhD work on the white x Engelmann spruce hybrid zone.

Torre, A. R. D. La, Wang, T., Jaquish, B., & Aitken, S. N. (2013). Adaptation and exogenous selection in a Picea glauca x Picea engelmannii hybrid zone: implications for forest management under climate change. New Phytologist.