About this recording 481–7 President Richard M. Nixon Alexander P. Butterfield White House operator H. R. Haldeman Stephen B. Bull James D. Hodgson Jeanne Ehrlichman Bertha Denny Henry Ahlgram April 17, 1971 Alexander P. Butterfield White House Operator H. R. Haldeman Stephen B. Bull James D. Hodgson Bertha Denny Henry Ahlgram Richard M. Nixon John D. Ehrlichman Secret White House Tapes | Richard M. Nixon Presidency 481–7 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