How did people find books in a library before there were computers? This page will tell you about card catalogs. Click on the pictures (in order) to see a big version and read the text below it.
1. Every time the library got a book, a librarian wrote down or typed the information about the book on a little card. You can see on the card above the author, the title, when the book was published, and what the book is about-- all the information that you would see if you looked up a book in an online catalog today.