I managed to find a copy of McElligot’s Pool, one of the not-banned Dr. Seuss works that the publisher has shredded and that is forbidden to sell on eBay:
Avert your eyes from the hateful language (“Eskimo”) and note from the stamp that this book was preserved in the library of the Cairo American College. Although PDFs are being preserved by the Russian-created Library Genesis, perhaps libraries in Islamic nations will be instrumental in preserving hardcopies. As noted in “Who preserved Greek literature?”, Islamic libraries were important for preserving some analogously specialized ancient texts:
- The history of medicine and mathematics. For these areas, Syriac and Arabic versions can be very important. In some cases — though still a minority — they are the only surviving versions of ancient texts.
- Some non-canonical Jewish and Christian writings. Many were written originally in Hebrew or Aramaic, but some like the Ladder of Jacob appear to have been written originally in Greek, and now survive only in translations into Slavonic, Coptic, Ethiopic, Armenian, or Georgian.
- Some individual literary and historiographical texts…
- Ancient scholarly commentaries on scientific works, and fragments of certain lost authors.
(The same article notes that the typical Greek text was preserved in Greek by monasteries in what we call the Byzantine Empire.)