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A roof bolting machine works on the ceiling of the mine at Pattison Sand Company in Garnavillo, Iowa on June 5, 2013.
Copyright
© 2013 Stephen Mally
Image Size
5124x3576 / 4.9MB
A roof bolting machine works on the ceiling of the mine at Pattison Sand Company in Garnavillo, Iowa on June 5, 2013.