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J.D. Ponting, junior chemist in division of commodity processing, conducts a galvanometer test on vitamin C content of dehydrated vegetable. Regional agricultural research laboratory, Albany, California
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Credit lineJ.D. Ponting, junior chemist in division of commodity processing, conducts a galvanometer test on vitamin C content of dehydrated vegetable. Regional agricultural research laboratory, Albany, Californ. 1942-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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