Não informado. (2022). USDA Forest Service Research Note NE. Northeastern Forest Experiment Station.
Chicago-referens (17:e uppl.)Não informado. USDA Forest Service Research Note NE. Upper Darby, Pa: Northeastern Forest Experiment Station, 2022.
MLA-referens (8:e uppl.)Não informado. USDA Forest Service Research Note NE. Northeastern Forest Experiment Station, 2022.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.