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based on the Subject.
* Title catalog: a formal catalog, sorted alphabetically according to the article of the entries.
* Dictionary catalog: a catalog in which all entries (author, title, subject, series) are interfiled in a single alphabetical order. This was a widespread form of card catalog in North American libraries prior to the introduction of the computer-based catalog.
* Keyword catalog: a subject catalog, sorted alphabetically according to some system of keywords.
* Mixed alphabetic

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