Public domain
Small farmers hire a scientist. Measuring the butter fat content in a sample of milk. Every farmer today must make use of the modern methods if he is to obtain the maximum income from his farm. Black Hawk County, Iowa
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineSmall farmers hire a scientist. Measuring the butter fat content in a sample of milk. Every farmer today must make use of the modern methods if he is to obtain the maximum income from his farm. Black . 1939-01-01. Rothstein, Arthur. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.