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Utah steel mill, emissions Kings Mountain National Military Park Env. Awareness EV IB Utah Steel Mill steam on a cold winter day give impression of pollution
View of polluted water sign Kings Mountain National Military Park
Water pollution Kings Mountain National Military Park Env. Awareness EV 9A Water Pollution
Yellowstone photo album 18, page 173 Yellowstone National Park
View on map 
Circa 1931
View series 
Yellowstone photo album 20, page 183 Yellowstone National Park
View on map 
Circa 1939
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