[MichaelRo]

Well, it's an idea. Perhaps de-humidifying the books first...

The hypoxic approach needs to last at least until eggs hatch, otherwise you're back to square one. And I'm not so sure if a plastic bag can hold tight for long without leaking (nitrogen out, air in).

[tokai]

Most insect eggs require external oxygen exchange. Low oxygen treatment against beetles is a common method used for stored grains.

[FinnKuhn]

De-humidifying the books however could also damage them so I believe their solution is probably the best for this purpose.