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Are you Nico Castel, author of the books below?
The Libretti of Mozart's Completed Operas by Nico Castel Italian Belcanto Opera Libretti by Nico Castel A Singer's Manual of Spanish Lyric Diction by Nico Castel Italian Belcanto Opera Libretti by Nico Castel Italian Belcanto Opera Libretti Vol. iii by Nico Castel French Opera Libretti by Nico Castel French Opera Libretti Vol. II by Nico Castel Nico Castel Ladino Songbook by Nico Castel Handel Opera Libretti Vol. I by Nico Castel Verismo Opera Libretti Vol. 1 by Nico Castel


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