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    Substitutes: Crushed stone, the other major construction aggregate, is often substituted for natural sand and gravel, especially in more densely populated areas of the eastern United States. Crushed stone remains the dominant choice for construction aggregate use.

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    7 The quantities for quartz sand and silica stone, in cubic meters, were as follows: 2003-05 150,000 (estimated); 2006 153,000 (estimated); 'and 2007 155,000 (estimated). 8 Fiscal years beginning March 21 of that stated. 9 Montenegro and Serbia formally declared independence in June 2006 from each other and dissolved their union.

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