US Presidential Aide A. Cornelius in the White House map room
"In his oval study on the second floor and in his oval office in the executive wing, Roosevelt's routine was the same as before. Now, however, he had a map room like Churchill's, and on his way to and from the office he liked to look in at the large charts with task forces and convoys clearly indicated."
J. Burns, Roosevelt: The Soldier of Freedom, New York, 1970, p.198.
Franklin D. Roosevelt Presidential Library & Museum