On July 21, 1972, H. R. ("Bob") Haldeman, White House operator, and Ronald L. Ziegler talked on the telephone at an unknown time between 12:07 pm and 1:02 pm. The White House Telephone taping system captured this recording, which is known as Conversation 027-031 of the White House Tapes.
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White House Tapes: Sound Recordings of Meetings and Telephone Conversations of the Nixon Administration, 1971-1973
Tape Subject Log