The National Stone, Sand & Gravel Association is a professional trade association, with a membership of stone, sand, and gravel producers, as well as related equipment manufacturers and service providers. The companies they represent within the aggregates industry are responsible for the raw materials found in residential and commercial buildings, roads, bridges, and public works projects throughout the United States. The NSSGA was created in February 2001 when 2 large aggregate associations, the National Aggregates Association and the National Stone Association, merged. - Source: Wikipedia
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