card catalog

library science

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June 22, 2026

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A card catalog is a library catalog in which entries are systematically arranged on cards. This method was an early solution to the challenge of updating library catalogs, allowing new entries to be filed easily between existing ones.12

Historically, library catalogs were often in book form, making additions difficult. The card catalog, with each entry on its own card, offered a more dynamic system. Libraries like the Library of Congress even sold catalog cards to other institutions, aiding smaller libraries.2

While card catalogs were valuable, the advent of computerized catalogs has largely replaced them. These digital systems offer greater search capabilities and ease of access, though card catalogs remain a significant part of library history.2

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Vehicles for catalogs
…was the creation of a card catalog, each entry having its own card and each card containing only one entry. In principle, such catalogs can grow in size indefinitely; any new entry can be filed between any two existing entries. Thus the catalog offers the opportunity to have a completely…
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…was the creation of a card catalog, each entry having its own card and each card containing only one entry. In principle, such catalogs can grow in size indefinitely; any new entry can be filed between any two existing entries. Thus the catalog offers the opportunity to have a completely…
Read More