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United States. Bureau of Transportation Statistics
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U.S. Customs and Border Protection
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Columbia
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1. United States Border Crossings, 2013
2011. United States. Bureau of Transportation Statistics and U.S. Customs and Border Protection. Border Crossing Ports are points of entry for land modes along the U.S. - Canadian and U.S.- Mexcian borders. The ports of entry are located in 15 ...