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I'm currently seeing around 107 pages that are 404'd with inbound referring links. I looked through a number of them and there is a wide variety of linking domains (not just one or two). I would go through and simply 301 redirect them to the best possible alternative. You might want to look at just the /international/ page since it has a good number of root linking domains by itself, but the others are probably best settled with just a 301 redirect.