Man, this makes me feel all warm and fuzzy. I just love books, have a large collection of my own (though obviously not on the scale of the article) and am always on the lookout for offbeat books (old/new/whatever) on any subjects that i find interesting. With Internet Archives/Project Gutenberg/etc. you can of course have your ebook versions but there is nothing like having a hard copy in hand.

The right book at the right time can often be transformative opening up your mind to new ideas/possibilities and leading to better knowledge and wisdom.

For example; reading Bergen Evans' The Natural History of Nonsense (https://archive.org/details/in.ernet.dli.2015.77094) from 1946, one of the earliest books on skepticism w.r.t. people's irrational beliefs/thinking/behaviour teaches you the importance of critical thinking for yourself which is arguably even more important today. A good review from Goodreads here - https://www.goodreads.com/review/show/2099042654

Another good collection are the excellent science/mathematics books from the erstwhile USSR many of which are now available at https://mirtitles.org/ A subset of those titles are available in hard copy form from low cost publishers on Amazon India. Checkout for example B.N.Ivanov's Fundamentals of Physics (https://mirtitles.org/2018/04/21/fundamentals-of-physics-iva...) and Roman Podolny's Something Called Nothing: Physical Vacuum: What Is It? (https://mirtitles.org/2013/11/24/something-called-nothing-po...) both of which are interesting takes on aspects of Physics.