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How old is Poland's Wieliczka salt mine?
How old is Poland's Wieliczka salt mine?
Learn about the Wieliczka salt mine in Poland, which operated for hundreds of years and features intricately carved sculptures and architectural elements made of salt.
Encyclopædia Britannica, Inc.
How old is Poland's Wieliczka salt mine?
Post-World War II Germany: Integration of refugees and displaced people
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