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You can find librettos and synopses in the Fine Arts Library's collections, eBooks, and on dozens of web sites. Below are just a few to get you started. Another great source for librettos is booklets included with CDs of operas in the Fine Arts Library.
Librettos : Resources in the Library
The University of Kentucky Libraries uses the Library of Congress Classification System for call numbers. Librettos can be found under ML50 and then alphabetical by composer. Collections of librettos can be found under ML48 and ML49. Check the Reference section, too, for librettos with IPA. You can browse the shelves or search by call number in InfoKat Discovery.
Music History Department of the German Historical Institute collection contains 1,500 historical libretto prints from L’Andromeda by Francesco Manelli (1637) and the early days of opera in Venice, since the opening of the first public opera houses, up to the year 1734.
The Albert Schatz Collection at the Library of Congress totals over 12,000 operatic and 238 oratorio and cantata librettos, including many first and early Italian, German and French editions from the 17th and 18th centuries.
Now, after more than ten years, this famous work of the stories of more than 300 of the world's great operas has been entirely revised, updated, expanded, and reset in a manner zestfully responsive to the explosion of enthusiasm for opera over the last decade."