Your brother sold them? That’s pretty harsh 🙁 I think I have at least one or two of the TO&E books, and the book of scenarios (Battlegrounds? Something like that).
Possibly my most treasured wargaming book is Charles Grant’s Battle. My brother-in-law gave it to me when I first started showing an interest in miniature wargaming. I was probably about 10. I’ve still got it.
I’ve just thought of another one, though it’s not quite what you asked. When I was much younger, my sister and brother-in-law gave me a copy of “Battlegames Book 4: World War 2”. It’s a book about the war, with four board wargames included. I never got rid of it, but I did lose all the counters and rules 🙁 Recently I managed to get hold of a complete copy (with counters and rules) for a very reasonable price on Ebay.