Pinus ponderosa subsp. ponderosa (Washoe Pine)
- Taxonomic notes and description of physical features.
- http://www.conifers.org/pi/pin/ponderosa1.htm

Pinus washoensis
- Includes distribution and occurrence, botanical and ecological characteristics, value and use, and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/pinwas/