ANSWERS: 2
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"Historical atlas of the United States" by the National Geographic Society.
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Now out-of-print but still available, a twelve-volume set entitled "The Smithsonian Guide to Historic America". Well-written and informative with superb photos/illustrations, a kinda 'geographical history' (or 'historical geography') which (I'm imagining) would be too cool to take along on an extended 'road trip'! - ;-)
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