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 Rewind 10 seconds Play/Pause Fast-forward 10 seconds 0:00 Download audio Previous 949–9 Next 450–1 More Richard M. Nixon Recordings View all Richard M. Nixon tapes 450–1 audio icon 47–1 audio icon 450–10 audio icon 450–11 audio icon 450–12 audio icon 450–13 audio icon 450–14 audio icon 450–15 audio icon 450–16 audio icon 450–17 audio icon