In brief, it is a rarity. Most libraries today use computer software to search their collections, which allows you to search in many different ways and to see if the particular publication you want is in the library, or out on loan.
A card catalog is an older method of searching the library's contents. Each book or magazine had (usually) 3 cards: Author, Title, and Subject. Thus, "The Hobbit" would have an Author card for Tolkein, a Title card for Hobbit, and a Subject card for Fantasy.
The card would give you a "call number" for the publication you are looking for, and you would then have to go to the shelves and try to find the book. If you didn't find it, it may be out on loan, or it may have been mis-filed, or the librarians may have withdrawn it from circulation for repair or some other purpose - you wouldn't really know. There were also problems with some people ripping the card out of a catalog, which made books harder to find.
A card catalog is found in a library. This catalog has the names of every book in alphabetical order. This catalog will tell you where the book can be found in the library.
A catalog card is an index card found in a library's card catalog. It contains the title, author's name, call number, and publishing information for one book in the library.
Card Catalog is the guide to the collection of books in a library. it is an alphabetical listing of all the books in the library, together with information on where they maybe located on the library shelves. Catalog card is the 3x5 card or index which consist of clasification numbers and biblioraphical information.
The library card catalog was retired from popular use in March 1956.
Author Card,Subject Card
If there are no cards about a book in a card catalog, it means that the book is not available in that particular library.
library card catalog
The library drawer-upon-drawer file that contains information about every book in the library is called the catalog or library catalog.
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author card;title card and subject card three kind of catalogue we find in library.
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most typically, "reference"