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The content may have value if copies of it were not preserved by the IEEE and AT&T.
The cassettes may have value to folks like me who collect outdated recording formats and want a few dozen tapes for each format they own. If the content has no value, then I'd try putting one lot of ~10 tapes at a time on ebay for 5-15$ starting bid per lot and see what they do. Even ~1$ per tape for several hundred tapes is better than 0$ trashing something that is no longer being made.
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