National apprenticeship and training standards for the sheet metal industry, developed and approved jointly by the Sheet Metal Contractors' National Association, inc., and the Sheet Metal Workers' International Association in cooperation with Bureau of Apprenticeship, U.S. Department of Labor
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National apprenticeship and training standards for the sheet metal industry,...
National Joint Apprenticeship and Training Committee for the Sheet Metal Industry1 editions
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National Joint Apprenticeship and Training Committee for the Sheet Metal Industry
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