A: I found an interesting topic in a book of a library.
B: I found an interesting topic in the book of a library.
Which of A and B is more natural as a description of the situation below?
<Situation> There were a lot of books in a library. In one of the books, I found an interesting topic.
"Of a library" is not natural there, so we have to correct that first. " A problem remains, though. "In the library" is likely to be taken to mean that you were in the library.
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"Of a library" is not natural there, so we have to correct that first. I would say "in the library", "the" meaning any library, like "the zoo" in the alternate lyrics to the popular song, "Happy birthday to you, you belong in the zoo …." A problem remains, though. "In the library" is likely to be taken to mean that you were in the library. To put the emphasis on the book, we have to recast: "I
It can't be 'the book'. That implies that the library had only one book, which contradicts the definition of 'library'. So you need
I found an interesting topic in a library book.
Or, you are making a contrast between that book (in the library) and another book (e.g., a book you found in a bookstore), and you have mentioned these two books previously in the conversati