Public domain
A milk tester for the Triple B milk testing associations. His equipment includes test tubes, pipettes, a centrifuge and laboratory apparatus seldom found on the farm. Black Hawk County, Iowa
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineA milk tester for the Triple B milk testing associations. His equipment includes test tubes, pipettes, a centrifuge and laboratory apparatus seldom found on the farm. Black Hawk County, Iowa. 1939-01-01. Rothstein, Arthur. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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