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22 points

I actually don’t know, but I gather it’s a sort of standardized filing system

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19 points

Yes, it has a card for every book that usually has the title, author, subject, publication date, and Dewey Decimal number of the book. Then you could use the Dewey Decimal number to find where it would be on the library shelves.

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21 points

Multiple cards per book; the idea was/is that you can look things up by subject to find book titles you didn’t know you were looking for

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