The Depression-era Farm Security Administration photography program to document the country during dire times — a program that employed the likes of Dorothea Lange and Russell Lee — has been lauded as one of the great triumphs of the medium. But the Atlantic looks at three new books —Walker Evans: Starting From Scratch, by Svetlana Alpers; Russell Lee: A Photographer’s Life and Legacy, by Mary Jane Appel; and Dorothea Lange: Words & Pictures, that paint a more complicated picture of the FSA’s legacy.