The excerpt "The Huntington Library, located in San Marino, California, contains a significant collection of rare books and manuscripts. A visitor of the library will...." The word "In fact" is missing giving "A visitor of the library will, In fact, find one of the original copies" This is further explained below.
Generally, The Huntington Library is simply defined as an Art Museum, and Botanical Gardens is a popular tourist destination and educational and research organization.
In conclusion, 'In fact' is omitted from the sentence, indicating One of the original copies can, in fact, be found by a library visitor.
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