Hundred Year Old Steam Tunnels Under Capitol Hill
The Origin of Washington's Water Supply
Conveyor Belt Delivery Systems at the Library of Congress
Origins of the Capitol Tunnel System
How Was It Built - Metro
Advise and Consent Drawings
Air Duct Towers on the Capitol West Front
The Carrier Corporation predicted - perhaps excessively - that the AC would have "a profound effect upon our governmental system! Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”