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A moving border, and the history of a difficult boundary
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US-Mexico border: 'Longest ever' smuggling tunnel discovered - BBC News
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Tijuana, Mexico, Map, History, & Facts
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Chronology: San Diego-Tijuana border region - The San Diego Union-Tribune
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US-Mexico Border World's Deadliest Migration Land Route
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Earthquake shakes U.S.-Mexico border region – The Daily Wildcat
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Drawing a Line: Encounters with the U.S.-Mexico Border — Incendiary Traces
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History of San Ysidro, Mexico Insurance Services
Used Book in Good Condition
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The US-Mexican Border into the Twenty-First Century (Latin American Silhouettes)
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Photos show border walls dividing the U.S. and Mexico
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Tijuana, Mexico, Map, History, & Facts
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Cut in two: travels along the US-Mexico border – a photo essay, Mexico
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How violent American vigilantes at the border led to Trump's wall, US news
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The growing number of migrant children detained on the border, explained - Vox