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Subclass AC
Collections. Series. Collected works
Subclass AE
Encyclopedias
Subclass AG
Dictionaries and other general reference works
Subclass AI
Indexes
Subclass AM
Museums. Collectors and collecting
Subclass AN
Newspapers
Subclass AP
Periodicals
Subclass AS
Academies and learned societies
Subclass AY
Yearbooks. Almanacs. Directories
Subclass AZ
History of scholarship and learning. The humanities