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What methods are used to prolong St. Petersburg's navigation season?

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Although the harbor is frozen for three or four months annually, icebreakers have prolonged the navigation season.

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Get more facts and information about Saint Petersburg . Or, view the full encyclopedia entry from The Columbia Encyclopedia, Sixth Edition.

Similar questions: How do icebreakers help the St. Petersburg navigation season? What tools prolong the St. Petersburg navigation season? [ Hide these questions ]

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