Public domain
In the Triple-B Association each cow's milk is tested every two months. The results are kept in a record book. In this way the farmer can accurately judge the producing value of each cow, weed out the poorest ones and breed the best. Black Hawk County, Iowa
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Credit lineIn the Triple-B Association each cow's milk is tested every two months. The results are kept in a record book. In this way the farmer can accurately judge the producing value of each cow, weed out the. 1939-01-01. Rothstein, Arthur. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.