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

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

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

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

His work in library and information science emphasized the importance of the social responsibility of librarians.

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

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

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

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.

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