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naturally accumulating mixture of sand gravel and crushed stone

naturally accumulating mixture of sand gravel and crushed stone

Alone, aggregate is used as the support for railroad beds, road covering, or fill; large quantities of sand and gravel and crushed stone are used on unpaved county roads throughout the state. Limestone, dolomite, and sandstone--the rocks used to make crushed stone--occur naturally, as do sand and gravel

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