Não informado. (2022). USDA Forest Service Resource Bulletin PNW. Pacific Northwest Forest and Range Experiment Station.
Chicago-referens (17:e uppl.)Não informado. USDA Forest Service Resource Bulletin PNW. Portland, Ore: Pacific Northwest Forest and Range Experiment Station, 2022.
MLA-referens (8:e uppl.)Não informado. USDA Forest Service Resource Bulletin PNW. Pacific Northwest Forest and Range Experiment Station, 2022.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.