I have an ancient copy of the Rubaiyat of Omar Khayyam
(book doesn't
even have a date or copyright page).
It was published in 1913. The illustrations are by Edmund Sullivan,
who died in 1933, so the copyright on them has indeed expired. I
would recommend that you convert them to PNG for better compression.
Since they are black-and-white line drawings, converting them en
masse from the existing GIF will be lossless and not sacrifice any
quality.
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