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On May 19, 1971, President Richard M. Nixon, H. R. ("Bob") Haldeman, White House operator, and William P. Rogers met in the Oval Office of the White House from 6:10 pm to 6:16 pm. The Oval Office taping system captured this recording, which is known as Conversation 501-030 of the White House Tapes. Topics include: The President met with H.R. ("Bob") Haldeman. Robert H. Finch's and Donald H. Rumsfeld's report Charles McC. Mathias Amendment - Debate Michael J. Mansfield Amendment - Debate - White House strategy - Debate, vote - Mansfield - Conversation with William P. Rogers - Rogers' call to Dwight L. Chapin [The President talked with the White House operator at an unknown time between 6:10 pm and 6:11 pm] [Conversation No. 501-30A] [See Conversation No. 3-68] [End of telephone conversation] - Vote - Mathias Amendment [The President talked with Rogers between 6:11 pm and 6:15 pm] [Conversation No. 501-30B] [See Conversation No. 3-69] [End of telephone conversation] The recording was cut off at an unknown time while the conversation was in progress. Participants: Nixon, Richard M. (President); Haldeman, H. R. ("Bob"); White House operator; Rogers, William P.