A complete general encyclopedia of 1921 — the world as it was understood just after the Great War, from Aachen to Zwingli, across twelve volumes and six thousand pages.

The Collier's New Encyclopedia Quiz

Every answer comes straight from the book. Finish and you'll get a challenge link to send a friend.

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Rights & ReuseThe complete text of Collier's New Encyclopedia (1921) is in the public domain in the United States — like all works published before 1928 — and is free to read, download, quote, teach from, and reuse. This digital edition (its transcription, restored images, and site design) is © 2026 PhotoOpAI, and any editorial commentary we add is clearly marked as ours; the underlying public-domain text carries no such restriction.