Is "Secrets from the past" in the public domain?

Yes, "Secrets from the past" by National Geographic Society (U.S.) is in the public domain.

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1979 first published

XII · Education

Name: Secrets from the past
Author: National Geographic Society (U.S.)

Subjects Archaeology · Textbooks

Language ENG

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Secrets from the past, written by National Geographic Society (U.S.), is now in the public domain and available here for free download. this title joins thousands of works in our education collection.

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