Numeration Systems
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Copyright
Registered 1Nov68 · JP12659 (Jul-Dec 1970) Copyright holder: Educational Projections Corp Registered 11Nov69 · JP12671 (Jul-Dec 1970) Copyright holder: Educational Projections Corp
Sources
- U.S. Copyright Office, Catalog of Copyright Entries (renewals, 1970–1978) — title, year, creator, length, copyright
Record added 2026-06-28T20:20:11Z