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On August 2, 1971, H. R. ("Bob") Haldeman and Clark MacGregor talked on the telephone at an unknown time between 1:19 pm and 11:07 pm. The White House Telephone taping system captured this recording, which is known as Conversation 007-058 of the White House Tapes. Topics include: H. R. ("Bob") Haldeman talked with Clark MacGregor. [See Conversation No. 553-6Q] MacGregor's location Lockheed Amendment - The President's calls - William V. Roth, Jr. - John B. Connally - Roth - J. Caleb Boggs MacGregor - Old Executive Office Building. Participants: Haldeman, H. R. ("Bob"); MacGregor, Clark.