The Bobtail mill, at Black Hawk, Colo.
Picryl description: Public domain image related to an industrial revolution, industry history, factory building, free to use, no copyright restrictions image.
In the "Bobtail" mine, Black Hawk canyon, Colorado, U.S.A.
Picryl description: Public domain image of a coal mine, mining, free to use, no copyright restrictions.
The Bobtail mill, at Black Hawk, Colo.
Public domain scan of a print - round portrait, medal, medallion, free to use, no copyright restrictions - Picryl description.
In the "Bobtail" mine, Black Hawk canyon, Colorado, U.S.A.
Picryl description: Public domain image of a coal mine, mining, free to use, no copyright restrictions.
The Bobtail mill, at Black Hawk, Colo.
Public domain scan of a print - round portrait, medal, medallion, free to use, no copyright restrictions - Picryl description.
The Bobtail mill, at Black Hawk, Colo.
Picryl description: Public domain image related to an industrial revolution, industry history, factory building, free to use, no copyright restrictions image.