Did migration ever change in the 20th century?

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And did it change in 20th century compared to the 19th century? Interesting questions...

Added: Oct. 13, 2017, 5:02 a.m. Last change: Oct. 13, 2017, 5:02 a.m.
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profile photo Tomáš Zukal 6 years, 6 months ago
 

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