Memorandum from President Franklin D. Roosevelt to Vice President Harry S. Truman, January 22, 1945. President's Secretary's Files - Longhand Notes.
January 22, 1945
MEMORANDUM FOR THE VICE PRESIDENT:
If you have any urgent messages which you wish to get to me, I suggest you send them through the White House Map Room. However, only absolutely urgent messages should be sent via the Map Room. May I ask that you make them as brief as possible in order not to tie up communications. If you have very lengthy messages the Map Room officer will have to exercise his discretion as to whether it is physically possible to send them by radio or whether they will have to be sent by pouch.
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