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The North American Industry Classification System (NAICS) is the standard used by Federal statistical agencies in classifying businesses. 

NAICS uses six-digit codes at the most detailed level, with the first two digits representing the largest business sector, the third designating a subsector, the fourth designating the industry group, and the fifth showing the particular industry.

Use the documents below, which are labeled by series, to see Department of Energy facilities that have historically procured goods/services in that series.