Books Europe On The Move (1948)

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The migratory movement is at once perpetual, partial, and universal. It never ceases, it affects every people, but at a given moment it sets in motion only a small number of each population; hence the illusion of immobility. In fact, there is never a moment of immobility for any people, because no migration remains isolated
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https://archive.org/download/EuropeOnTheMove/Europe-On-The-Move.pdf