Land O'Lakes butter in 1941. Sixty-seven years later, this product's packaging has changed little.
Photo by John Vachon at a butter packing plant in Chicago.
Showcasing some of the 160,000 images taken between 1935 and 1944 by government-hired photographers. (If you were to look at 100 of them per day, every day, you'd need more than four years to view them all).