The opening of Harding's papers for research in 1964 sparked a small spate of biographies, of which the most controversial was Russell's The Shadow of Blooming Grove (1968), which concluded that the rumors of black ancestry (the "shadow" of the title) deeply affected Harding in his formative years, causing both Harding's conservatism and his desire to get along with everyone. Coffey faults Russell's methods, and deems the biography "largely critical, though not entirely unsympathetic."[257] Murray's The Harding Era (1969) took a more positive view of the president, and put him in the context of his times. Trani and Wilson faulted Murray for "a tendency to go overboard" in trying to connect Harding with the successful policies of his cabinet officers, and for asserting, without sufficient evidence, that a new, more assertive Harding had emerged by 1923.[258]
Later decades saw revisionist books published on Harding. Robert Ferrell's The Strange Deaths of President Harding (1996), according to Coffey, "spends almost the entire work challenging every story about Harding and concludes that almost everything that is read and taught about his subject is wrong.