> This is a gray area.  The copyright is only good for 50 years, but congress
> keeps messing with it, so the attorneys say 75 years, but even this may not
> be the case in the future.  

No. For old works in the US, it's 75 years. For new works, it's
life+50, and Congress is threatening to change it to life+70 or
life+90. They're also threatening to change the 75 year period to 95.

> I wonder if we could find Mr. Sigerist and get his permission to use the
> book?  Who is the publisher?  Heck, it's only 44 pages long.  It only takes
> a phone call.

That would be a fine idea, if he really owns the copyright. Many such
copyrights are owned by corporations. If you are published by an
academic press, the copyright sometimes reverts when your book goes out
of print, but that's a contractual thing.

-- g

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