Picea
- Description of the genus of the spruce tree, including taxonomy, range, ethnobotany, and the largest and oldest known specimens. Links to information on some species.
- http://www.conifers.org/pi/pic/

Picea rubens
- Distribution and Occurrence; Value and Use; Characteristics; Fire Ecology
- http://www.fs.fed.us/database/feis/plants/tree/picrub/

Picea pungens
- Information on distribution and occurrence, value and use, characteristics, and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/picpun/

Picea engelmannii
- Distribution and Occurrence; Value and Use; Characteristics; Fire Ecology
- http://www.fs.fed.us/database/feis/plants/tree/piceng/