Statistics for occurrence #1 of “Mr. Lincoln” in chapter 20 of William H. Herndon, Jesse William Weik, Herndon's Lincoln: The True Story of a Great Life, Etiam in minimis major, The History and Personal Recollections of Abraham Lincoln by William H. Herndon, for twenty years his friend and Jesse William Weik:

...he President. At the end of an inner passage leading to the box door, one of the President's messengers was stationed to prevent unwelcome intrusions. Booth presented a card to him, stating that Mr. Lincoln had sent for him, and was permitted to pass. After gaining an entrance and closing the hall door, he took a piece of board prepared for the occasion, and placed one end of it in an indentation in ...
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