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Start Over Subjects United States ✖Remove constraint Subjects: United States Subjects Equipment and Supplies -- standards ✖Remove constraint Subjects: Equipment and Supplies -- standards Authors Nelson, Norton A., author ✖Remove constraint Authors: Nelson, Norton A., author Authors Brackett, Frederick S. (Frederick Sumner), 1896-1988, author ✖Remove constraint Authors: Brackett, Frederick S. (Frederick Sumner), 1896-1988, author Genre Technical Report ✖Remove constraint Genre: Technical Report Copyright Public domain ✖Remove constraint Copyright: Public domain

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