Commercial standards monthly: a review of progress in commercial standardization and simplification May 1931 : National Bureau of Standards of the U.S. Department of Commerce : Free Download, Borrow, and Streaming : Internet Archive
U.S.A. Department of Commerce. National Bureau of Standards. Iron Gallate inks—liquid and powder - Analyst (RSC Publishing)
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Commercial standards monthly: a review of progress in commercial standardization and simplification May 1933 : National Bureau of Standards of the U.S. Department of Commerce : Free Download, Borrow, and Streaming : Internet Archive
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