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Workers on a lift knock down loose material through a process called scaling inside the mine at Pattison Sand Company in Garnavillo, Iowa on June 5, 2013.
Copyright
© 2013 Stephen Mally
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4848x3168 / 4.8MB
Workers on a lift knock down loose material through a process called scaling inside the mine at Pattison Sand Company in Garnavillo, Iowa on June 5, 2013.