Photographs of some of the women working at one of the Clinton, Iowa Roundhouses.
Photographs by Jack Delano for the FSA, taken in April-May 1943.
More on Delano, available here (NYT Lens article), here (NYT obituary), here (Smithsonian Archives of American Art, oral history interview), and here (International Center for Photography).
More on the Clinton roundhouses here (Clinton Herald).