About this recording 478–11 President Richard M. Nixon H. R. Haldeman Ronald L. Ziegler UNKNOWN April 13, 1971 H. R. Haldeman Ronald L. Ziegler Unknown Richard M. Nixon Secret White House Tapes | Richard M. Nixon Presidency 478–11 Backward Play Stop Forward Download audio Previous 477–9 Next 248–1 More Richard M. Nixon Recordings View all Richard M. Nixon tapes 248–1 audio icon 479–1 audio icon 248–10 audio icon 248–11 audio icon 248–12 audio icon 248–13 audio icon 248–14 audio icon 248–15 audio icon 248–16 audio icon 248–17 audio icon