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- Development of sand and gravel deposits
- Sand and gravel excavation.
- Sand and gravel excavation.
- Sand and gravel excavation.
- Sand and gravel excavation.
- Sand and gravel excavation.
- Mining and milling methods and costs at the glass-sand plant of P.J. Weisel, Inc., Corona, Calif.
- Sand and gravel operations and costs, Minneapolis-St. Paul area, Minn.
- Sealing openings in abandoned mines by pneumatic stowing