Reddit reviews The Book of 101 Opera Librettos: Complete Original Language Texts with English Translations
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It's not remotely what you're looking for, but a fun introduction to Opera for noobs like me is Forman's A Night at the Opera. It's quite funny and highly educational.
EDIT: The other opera book I have is The Book of 101 Opera Librettos, which I scored for a whopping dollar at a library book sale. I'm really just bragging with that one. :D