Distant Voices
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✎ Suggest a correctionTraces the connection between medieval advances in the science of warfare, the discovery of large silver deposits in Czechoslovakia, the discovery of natural laws, and the invention of modern telecommunications.
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- A-V Online (National Information Center for Educational Media). CD-ROM database of educational and documentary media, compiled and maintained by the National Information Center for Educational Media (NICEM). — title, year, creator, length, format, description
- 16mm Filmography (legacy record) — sound, catalog record
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