Sources-by-nation
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Afganistan (1)
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Argentina (1)
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Australia (2)
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Austria (4)
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Belgium (7)
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Bosnia (1)
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Brazil (1)
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Britain (18)
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Bulgaria (2)
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Canada (3)
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China (6)
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Colombia (1)
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Croatia (1)
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Czech (7)
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Denmark (1)
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Finland (6)
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France (16)
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Germany (38)
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Iran (1)
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Iraq (2)
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Ireland (1)
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Italy (28)
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Japan (4)
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Lithuania (1)
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Netherland (12)
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Norway (25)
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Pakistan (2)
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Poland (3)
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Romania (2)
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Russia (22)
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Serbia (3)
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Slovakia (1)
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Spain (12)
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Sweden (14)
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Swiss (10)
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Ukraine (2)
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USA (83)
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Yugoslavia (4)