user
  • 16 years ago
  • 2
  • 04:35

Longterm sustainability of quarries

Earth's physical resources: rocks for roads - for iPad/Mac/PC
0
توضیحات
A look at the road laying process. The need to supply locally, use natural road products and protect the environment around quarries.
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Nature
Education
سنین
محتوای تمیز
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فارسی