What libraries lost when they threw out the card catalog

‘The Card Catalog’ is a paean to the Library of Congress and a collection of bookish trivia
Read more: https://www.washingtonpost.com/entertainment/books/what-libraries-lost-when-they-threw-out-the-card-catalog/2017/07/07/5432821c-632f-11e7-a4f7-af34fc1d9d39_story.html?source=Snapzu