Using library card catalogs
Library card catalogs served as organizational systems to help locate primarily books, but also other documents.
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In libraries, each book had its corresponding card where all its information was cataloged and could be stored alongside other cards. Usually organized in alphabetical order, the cards were more easily accessed than the books themselves.
This system made it easier to understand the entire collection without having to go to each shelf and check each book.
Nowadays, libraries easily store all book information in computers and only need to type the name of the book or author to access all the information.