About this recording 903–18 President Richard M. Nixon UNKNOWN April 20, 1973 Unknown Richard M. Nixon Conversation No. 903-18 -Book The unknown man left at an unknown time before 12:15 pm. Secret White House Tapes | Richard M. Nixon Presidency 903–18 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