1. The Internet of Money vol1 and vol2: My introduction to the Bitcoin rabbit hole back then was Andreas Antonopoulos. Listened to a few of his talks, and liked his content so I bought the books so I can learn about Bitcoin while decreasing my computer screen-time. Unfortunately haven't purchased volume 3 yet because Bookdepository doesn't ship to the country I'm currently in right now due to the pandemic.
2. The Little Bitcoin Book: Purchased this in September of 2019 even though I already had the Bitcoin basics in my head. Purchased it just due to the curiosity. Obviously I learned little to nothing because the book is basic(as expected), but at least I supported the writers so there's that.
Would recommend these for beginners for sure.
Though these are only 3 books, I refused to purchase more Bitcoin-related books(for now) simply to widen my knowledge in economics and finance as a whole. Wouldn't want to be too Bitcoin-focused.
I obtained The Little Bitcoin Book for free from Token News Conference last November 2019 before I went to Singapore for The Capital and Blockshow 2019. As for the Cryptocurrency Wizards, I also got it for free at Token 2049 last March 2019 in Hongkong. But for the Blockchain Revolution, I bought it from a local bookstore.
But you were right though about having too much “Bitcoin-related” books. I would love to have a paperback copy of Ethereum-related or any other coin, token or blockchain out there, especially on the development side.