http://www.conifers.org/pi/pin/ - http://www.conifers.org/pi/pin/
Overview of the genus with descriptions and notes for 112 species. Includes images. |
White Pine Health Working Group - http://treehealth.agsci.colostate.edu/research/white_pine_health/WhitePineHealthWorkingGroup.htm
Organisation that studies the health and management of five needle pines (white pines) in the Central Rocky Mountains. |