Inverted File Retrieval
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Copyright
Registered 24Jun69 · MP21972 (Jul-Dec 1971) Copyright holder: Edutronics, Inc. whose full corporate name is Edutronics Systems International, Inc
Sources
- U.S. Copyright Office, Catalog of Copyright Entries (renewals, 1970–1978) — title, year, creator, length, copyright
Record added 2026-06-28T20:23:32Z