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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.
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© 2013 Stephen Mally
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Pattison Sand Company - Garnavillo, Iowa - June 5, 2013
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.