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The National Drilling Association is a nonprofit trade association of contractors, manufacturers and  affiliated members from the drilling industry representing the geotechnical, environmental and mineral exploration sectors of this industry. The NDA mission is to promote the use of professional drilling contractors and their methods. Founded in 1972, NDA has more than 200 member companies, some of which are international. View History

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The NDA office will be closed for the holidays December 24 through January 3.

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