Melvil Dewey, 1876: knowledge in ten main classes, each split by tens. Museums and small libraries still live by it. Search a word or tap a hall. This is the public summary, not a licensed DDC schedule.
Summaries follow the well-known public 10/100 outline of the Dewey Decimal Classification. OCLC owns the full schedules; this hall is a finding aid, not a substitute for WebDewey. 200s religion still centre Christianity — a 19th-century bias the plaque does not hide.