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What is a National Historic Landmark?
How many National Historic Landmarks are in the US?
Where is the only National Historic Landmark not on US soil?
What is the National Historic Site of the United States?
California (149) · Abbey, The, Joaquin Miller Home - 12/29/62 · Ahwahnee, The - 05/28/87 · Alcatraz Island - 01/17/86 · Alma (Scow Schooner) - 06/07/88.
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