This section is from the book "The National Capitol. Its Architecture Art And History", by George C. Hazelton, Jr. Also available from Amazon: The National Capitol Its Architecture Art and History.
Opening off the southern corridor of the gallery floor is a crowded, littered and irregular suite of rooms known as the Senate document rooms. These lie in the upper story of the annex as well as that of the old north wing. They are connected with the main hallway below by a winding staircase in the rear, by which only access can be secured during the executive sessions of the Senate. Amzi Smith is in charge. He has acquired such a wonderful knowledge of the legislation of Congress, and has become of such invaluable service, that his own name is incorporated by Congress in each appropriation act, so that no other person can be appointed in his place.