An intermediate stage of offset printing is aluminium plates (https://en.wikipedia.org/wiki/Offset_printing#Materials https://en.wikipedia.org/wiki/Offset_print

An intermediate stage of offset printing is aluminium plates (https://en.wikipedia.org/wiki/Offset_printing#Materials https://en.wikipedia.org/wiki/Offset_printing#Materials). They would survive a long time in conditions that would destroy paper. If after the zombie apocalypse people used them to build shelters, that wouldn't necessarily make them illegible, whereas paper books might be used as fuel.