| 11. | In the past century, the Ablach Valley became an important center for gravel mining.
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| 12. | These machines can be used to demonstrate traditional clay, sand and gravel mining techniques.
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| 13. | Other activities that harm salmon are gravel mining, dredging and road building, scientists say.
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| 14. | But sanctuary status at Stellwagen Bank currently brings little more than restrictions on sand and gravel mining.
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| 15. | As the area was depopulated for many years, bush logging and gravel mining continued with vigour.
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| 16. | The local economy is based on agriculture, small businesses, gravel mining and a regional landfill.
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| 17. | The town neighbors an area of gravel mines, so its geography is spackled with mining lakes.
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| 18. | ,the most heavily contaminated areas at Cornhusker are the burning grounds with buried and unexploded gravel mines.
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| 19. | This year he was unable to pass legislation to stop an expansion of gravel mining on Maury Island.
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| 20. | Desert Island, Lamoine is a bedroom community to Ellsworth and Bar Harbor with an active gravel mining industry.
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