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Single and return tickets - Transport for London
Pen and Sword Books: The London Underground, 1968-1985
London Underground Books - Goodreads
London Transport Books
Underground, Overground: A Passenger's History of the Tube
Travelcards and group tickets - Transport for London
All On The Board: The Official Sunday Times Bestseller
London Underground Guide 2015 Hardcover – 28 Mar. 2015
A to Z of London Underground Stations - Book - Videoscene
The Little Book of the London Underground Hardcover