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It's "Historical truth". Historical truth is is the truth about the past.
Things as they really were. Truth is eternal and unchangable. It is a recent philosophy that theorizes that truth is relative. It is not.
Consider your being born. The birth event is historical - at least for you and yours.
The address of the Sierra County Historical Society is: 211 Main St, Truth Or Consequences, NM 87901-2838
No. It is a work of fiction presented in documentary form.
The web address of the Sierra County Historical Society is: http://www.geronimospringsmuseum.com