Dox Thrash, "Cabin Days" Prints, c.1938-1939.Thrash, Dox:

(1892-1965) Head of graphics at the Philadelphia WPA, Thrash often depicted African American workers, which for the first time were allowed to work industrial jobs (there was a lack of workers because of the war). Thrash was a part of the Philadelphia fine print shop and exhibited his work numerous times throughout the nation.

http://www.philamuseum.org/micro_sites/exhibitions/thrash/flash.html

Source: Patton, Sharon F. African-American Art. Oxford: Oxford University Press, 1998. 147-148.