"In 1987 the British historian Mark Lewisohn invited me to collaborate on a book project about locations associated with The Beatles in London...On several research trips between 1987 and 1990 we visited Beatles sites together. In 1989 Adam Smith joined the project. It all resulted in the book "The Beatles' London" (Hamlyn. 1994)."
Check out the rest of the collection at The Beatles' London Flickr page. Via.
