The Beatles Got Started in Hamburg. There's a Reason for That. - JSTOR Daily
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George Harrison Said The Beatles 'Didn't Have a Clue' Before They Went to Hamburg, Germany
How a Stint in Hamburg Helped Catapult the Beatles to Superstardom, Smart News
Love The Beatles? Then all you need is Hamburg where the Fab Four first performed 60 years ago
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Schau and tell: visiting The Beatles' Hamburg – Free as a Blog
Book Review: The Beatles in Hamburg - WSJ
Hamburg papers – The Daily Beatle
It's been a Hard Day's Hamburg
The Beatles in Hamburg - Wikipedia