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His principles led to the simplification and standardization of cataloging rules in the mid-20th century.

Developed Cutter Expansive Classification system and rules for a dictionary catalog.

Curated the Morgan Library, was instrumental in shaping it as a world-class collection.

Created the Universal Decimal Classification, an early concept of the internet called 'Mundaneum'.

Founder of Banned Books Week and was an advocate for intellectual freedom and the First Amendment.

Collected and curated 'Navigationi et viaggi', a series of travel writings that was a precursor to geographic and cultural libraries.

Developed the Five Laws of Library Science and the Colon Classification system.

Developed the MARC standards (Machine Readable Cataloging) for the digital cataloging of books in libraries.

Invented the Dewey Decimal System for library classification, founded the American Library Association.

His personal library formed the nucleus of the Library of Congress, had a unique cataloging system.

A librarian who was also a prominent modern Chinese writer and critic, contributing to modern Chinese literature.