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All answers having "Baltic port" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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KIEL

RIGA



5 Character Answers:

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MEMEL

YSTAD



6 Character Answers:

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LUBECK



7 Character Answers:

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ROSTOCK



15 Character Answers:

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HELSINKIFINLAND

KIELWESTGERMANY

STOCKHOLMSWEDEN