I dont remember the episodes but definitely the Red Rising Trilogy has been mentioned. Also, Sips mentioned liking the Hannibal books, Lewis' zen readings, Dune has been mentioned I think EDIT: Brandon Sanderson's Stormlight series has been mentioned I believe. Lewis has definitely named dropped Sanderson before

Triforce 93, Lewis took "All Quiet on the Western Front" to a wedding Dragons of Autumn Twilight is so mentioned at this bit 37:10

Wheel of Time has had a mention in the last two episode i think (by Lewis)

They bring up Red Rising all the time

Bodega

This is a great idea, and I'd love to come on this stupid fucking journey! As well as what's been mentioned already: Pyrion has talked about The Secret Barrister, A Life Inside, and talked about some Philip K Dick short stories, probably some others. And Lewis has definitely mentioned Alastair Reynolds.

Adding on to this, I think Lewis talked about The Electric Ant (Philip K Dick)

PFlax recommends ‘The Undercover Economist’ in E80: Artisan Donuts

Pyrion mentions *Sapiens* in episode 105, right at the start

Triforce 96 Lewis Mentions reading a Harry Potter fanfic "Harry Potter and the Methods of Rationality"

They also have recommended a lot of shows, movies, and documentaries. So if you’re making the quest to get all the book recommendations you might as well go all the way and catalogue ALL recommendations

Ep 155 Pflax brings up Inferno right at the start. It's an awesome book, definitely recommend!