Conversation so far:
When was Father Ximenez's manuscript written?
In or around 1714, Ximenez incorporated the Spanish content in book one, chapters 2-21 of his Historia de la provincia de San.
What was the significance of these manuscript?
Scherzer found Ximenez's writings in the university library, noting that there was one particular item "del mayor interes" ('of the greatest interest').

Question: What was the name of the Library?
Self-contained rewrite: What was the name of the Library where Scherzer found Ximenez's writing?