rubber shortages / food source / chemical effects / cooler site / important food source / rubber / treatment for cancer / food / /
NaturalFeature
Mountain Big Sagebrush / Ponderosa forest / Rocky Mountains / Pine forest / Ponderosa Pine forests / MT. Philadelphus / Small desert / Colorado Plateau / Ponderosa Pine forest / Sierra Nevada / Boise valley / /
Person
Fern Bush / Douglas Fir / Rubber Rabbitbrush Rubber Rabbitbrush (Gray Rabbitbrush) / Douglas Hawthorn / /
ProvinceOrState
Alberta / Dakotas / Nebraska / New Mexico / Utah / Alaska / Montana / Nevada / Nova Scotia / Oregon / British Columbia / California / Georgia / Arizona / Colorado / Washington / New Hampshire / /
Region
southern British Columbia / central Mexico / western US / /