Magnum: 50 years at the frontline of history, by Russell Miller (Pimlico, £12.50 in UK)

If every picture tells a story, then Magnum's magnificent photographs have been telling the story of our century since the agency's foundation in New York in 1947; its own house, however, as this gossipy, warts-and-all paperback history shows, has rarely been in order. An eye-opening read, to put it mildly.