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A library classification system that divides knowledge into ten main classes, with further subdivisions, facilitating the arrangement of books on library shelves by subject.

The principle in archiving that refers to the original source or origin of archival materials, used to maintain context and ensure authenticity.

Institutions or facilities that collect, manage, and preserve historical documents and records for long-term research and public access.

An alphanumeric library classification system that is more complex than the Dewey Decimal system, used primarily in research and academic libraries to organize their collections by subject.

A tool created to help users discover information within archival collections, often including information about the scope, content, and organization of the collection as well as historical or biographical notes.

The process by which libraries loan materials to patrons for a specified period of time, and later return them to the collection or process new loans.

Institutions that acquire, organize, provide access to, and manage collections of books, periodicals, and other media for the purpose of public or academic information and education.

Original documents, personal papers, or letters that provide firsthand accounts and data on a particular historical period, usually collected and preserved in archives.

Services provided by libraries that help patrons locate information and use library resources effectively, often including in-person or virtual assistance, guides, and instructional programs.