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Main source

The alleyways and courtyards of London: O – The Undergroun

Citations and sources

London Street Names (book)
Gillian Bebbington's 1972 work on street name derivations
The free encyclopedia

Links and further reading

Survey of London | British History Online
Hidden London
Histor­ically inclined look at the capital’s obscure attractions
Edith’s Streets
A wander through London, street by street
All-encompassing website