Charlton, Michael ; Moncrieff, Anthony, Many Reasons Why: The American Involvement in Vietnam , [1978], London, Hill and Wang, 1989, pp. 250 Based on BBC series of programmes and consisting primarily of interviews with wide range of those involved in first French and then US policy on Vietnam, and individuals prominent in opposition. Covers period 1945-1973. Chapters 7 and 8 discuss protests inside US and the leaking by Daniel Ellsberg of The Pentagon Papers , which revealed in detail secret internal policy making.