On April 28, 1973, Ronald L. Ziegler, Camp David operator, and Gerald L. Warren talked on the telephone at Camp David at an unknown time between 7:20 pm and 8:10 pm. The Camp David Study Table taping system captured this recording, which is known as Conversation 164-025 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