London's UndergroundWhat to See & How to Travel Underground. Issued Free. Map of the Electrical Railways of London

Chicago citation style
Gill, Leslie MacDonald, 1884-1947, Dangerfield Printing Company. London's Underground,What to See & How to Travel Underground. Issued Free. Map of the Electrical Railways of London. 1922. Retrieved from the Digital Public Library of America, https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~281780~90054727. (Accessed December 10, 2018.)
APA citation style
Gill, Leslie MacDonald, 1884-1947, Dangerfield Printing Company, (1922) London's Underground,What to See & How to Travel Underground. Issued Free. Map of the Electrical Railways of London. Retrieved from the Digital Public Library of America, https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~281780~90054727
MLA citation style
Gill, Leslie MacDonald, 1884-1947, Dangerfield Printing Company. Retrieved from the Digital Public Library of America <https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~281780~90054727>.
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