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.

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