Colorado Blue Spruce - Arnold Arboretum

Colorado Blue Spruce - Arnold Arboretum

Conifer Collection - Arnold Arboretum

Spruce Trees D'Alessandro's Nursery & Garden Center

January Tree of the Month-Colorado blue spruce

Conifer Collection - Arnold Arboretum

Abies lasiocarpa - Trees and Shrubs Online

Blue spruce The Morton Arboretum

Abies recurvata var. recurvata Threatened Conifers of the World (en-GB)

Colorado Blue Spruce - Arnold Arboretum