His exhaustive interviews resulted in a series of acclaimed, best-selling books. "Division Street: America," his first success, published in 1966, was about the social conflicts that roiled in urban America in the 1960s. "Hard Times" (1970) explored people's experiences during the Great Depression. "Working" (1974) asked people why they did what they did for a living, whether they enjoyed it, and what role it played in their lives. "The Good War," his oral history of World War II, won the Pulitzer Prize for nonfiction in 1985.