Public domain
Recovery. Butadiene, which did not take part in the reaction, is cooled, condensed and recovered
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineRecovery. Butadiene, which did not take part in the reaction, is cooled, condensed and recovered. 1935-01-01. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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