Despite one foot deformed by polio, or perhaps in part because of it, Dorothea Lange became a photographer who focused extensively, and invaluably, on the usually unseen and ignored: migrant workers and farmers in the Dust Bowl of the Thirties, Japanese-Americans forced into U.S. internment camps in the Forties, and so on. The images she captured are haunting, and linger with you – as does this very informative, understandably tender biographical study. Dyanna Taylor, who’s worked on