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The Wikipedia article on Sylt gives the population as 21,000.
The airport code for Sylt Airport is GWT.
Will Sohl has written:
'Will Sohl und die Insel Sylt' -- subject(s): Sylt in art
Out of It - album - was created in 2008.
Peter Schmidt-Eppendorf has written:
'Sylt' -- subject(s): History
'Sylt: Memoiren e. Insel'